Shop All Cell, Tissue, & In Vivo Labeling Reagents

CellTracker™ Red CMTPX Dye (Invitrogen™)

CellTracker™ Red CMTPX is a fluorescent dye well suited for monitoring cell movement or location. After loading the cells, the dye is well retained, allowing for multigenerational tracking of cellular movements. The deep red excitation/emission spectra are ideal for multiplexing with green fluorescent dyes and proteins.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

• Easy to use—remove medium, add dye, incubate 30 minutes, and image cells
• Fluorescent signal retention of >72 hours (typically three to six generations)
• Red excitation/emission spectra (577/602 nm maxima) ideal for multiplexing
• Low cytotoxicity—does not affect viability or proliferation

The CellTracker™ Red CMTPX fluorescent dye has been designed to freely pass through cell membranes into cells, where it is transformed into cell-impermeant reaction products. CellTracker™ Red CMTPX dye is retained in living cells through several generations. The dye is transferred to daughter cells but not adjacent cells in a population. CellTracker™ Red CMTPX dye is designed to display fluorescence for at least 72 hours, and the dye exhibits ideal tracking properties: it is stable, nontoxic at working concentrations, well retained in cells, and brightly fluorescent at physiological pH. Additionally, the excitation and emission spectra of CellTracker™ Red CMTPX dye are well separated from GFP (green fluorescent protein) spectra allowing for multiplexing.

CellTrace™ CFSE Cell Proliferation Kit, for flow cytometry (Invitrogen™)

CellTrace™ CFSE Cell Proliferation Kit is used for in vitro and in vivo labeling of cells to trace multiple generations using dye dilution by flow cytometry.

• Superior performance—bright, single-peak staining enables visualization of multiple generations
• Long-term signal stability—well-retained in cells for several days post stain
• Non-toxic—staining does not adversely effect cell health
• Simple, robust staining protocol

View a selection guide for all CellTrace™ Cell Proliferation Kits for flow cytometry.

Superior fluorescent staining
Successful proliferation analysis by dye dilution (see figure below) requires an extremely bright dye to distinguish fluorescently labeled cells from auto-fluorescence after several cell divisions. The intense fluorescent staining provided by CellTrace™ CFSE dye enables the visualization of eight or more generations of proliferating cells before the signal is overwhelmed by intrinsic cellular auto-fluorescence. Consistent, homogeneous staining results in very little fluorescence variation between cells in a population, so distinct generations can be seen without any requirement for complex modeling software.

Long-term signal retention
Unlike stains that label the lipid membrane of cells, CellTrace™ CFSE dye easily crosses the plasma membrane and covalently binds inside cells where the stable, well-retained fluorescent dye is designed to provide a consistent signal, even after several days in a cell culture environment.

Non-toxic
CellTrace™ CFSE dye binds covalently to all free amines on the surface and inside of cells and shows little cytotoxicity, with minimal observed effect on the proliferative ability or biology of cells. Researchers have used CFSE SE labeling to show that transplantable hematopoietic cells proliferate in vitro in response to stimulation by a growth factor cocktail.

Simple, robust staining protocol
The CellTrace™ CFSE Cell Proliferation Kit contains convenient single-use vials of dry dye to permit small-scale experiments without preparing excess quantities of dye. A stock solution is prepared by dissolving the contents of a vial in anhydrous DMSO prior to use. To stain 1 mL of cells in protein-free medium, 1 µL of this stock solution is typically used. Cells should be stained for 20 minutes at room temperature with gentle agitation. A brief wash with complete medium will then quench any dye remaining in solution.

CellTrace™ Oregon Green™ 488 Carboxylic Acid Diacetate, Succinimidyl Ester (Carboxy-DFFDA, SE), cell permeant, mixed isomers (Invitrogen™)

Like CFDA SE, CellTrace™ Oregon Green® 488 (carboxy-DFFDA SE) should be a useful tool for following proliferating cells. This Oregon Green® 488 probe passively diffuses into cells, where it is colorless and nonfluorescent until its acetate groups are removed by intracellular esterases to yield a highly fluorescent, amine-reactive dye. Upon reaction with intracellular amines, the probe forms Oregon Green® 488 conjugates that are well-retained by cells. Unlike fluorescein conjugates, Oregon Green® 488 conjugates exhibit bright, photostable green fluorescence that is independent of pH at typical cellular pH values (pH-6-8).

CellTrace™ BODIPY™ TR Methyl Ester (Lipophilic Counterstain For GFP) (Invitrogen™)

The red-fluorescent CellTrace™ BODIPY® TR methyl ester is an excellent counterstain for cells and tissues that are expressing GFP. CellTrace™ BODIPY® TR methyl ester readily permeates cell membranes and selectively stains mitochondria and endomembranous organelles such as endoplasmic reticulum and the Golgi apparatus, but does not appear to localize in the plasma membrane. CellTrace™ BODIPY® TR methyl ester staining is retained after paraformaldehyde fixation.

Qtracker™ 655 Cell Labeling Kit (Trial Size) (Invitrogen™)

The Qtracker® 655 Cell Labeling Kit uses a custom targeting peptide to deliver far red-fluorescent Qdot® 655 probe (ex/em 405–615/655 nm) into the cytoplasm of live cells. Once inside the cells, the Qdot® 655 probe provides an intense, stable fluorescence that can be traced through several generations and is not transferred to adjacent cells in a population. This trial-size version offers a convenient introduction to the Qtracker® cell labeling technology at an affordable price.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

Features of the Qtracker® Cell Labeling kits include:

• Qtracker® probes allow for continuous illumination, without photobleaching or degradation problems often associated with organic dyes
• Simple to use—add Qtracker® labeling solution to cells in serum-containing media, incubate one hour, then detect and track the cells
• Provide an intense, stable fluorescence that can be traced through several generations
• Excellent tool for long-term tracking or imaging studies of live cells, including migration, motility, morphology, and other cell function assays

The Qtracker® Cell Labeling kits use a custom targeting peptide to deliver Qdot® probes into the cytoplasm of live cells. Since the cytoplasmic delivery mechanism is not mediated by a specific enzyme, no cell-type specificity has been observed. Maximum delivery is typically accomplished in less than 1 hour.

The Qdot® probes are compatible with serum-sensitive cells. The intense fluorescence from the Qdot® probes is maintained in complex cellular environments and under various biological conditions including changes in intracellular pH, temperature, and metabolic activity.

Long-Lasting, Targeted Signal
Use of Qtracker® Cell Labeling kits results in the ability to observe labeled cells with extensive continuous illumination, without photobleaching or degradation problems often associated with organic dyes. Once inside the cells, the Qdot® probes are localized to cytoplasmic vesicles and are inherited by daughter cells for at least six generations. Fluorescence from the Qdot® probes can be detected for up to a week after delivery in some cell lines. The long-term cellular retention of the Qdot® probes results in an ideal tool for studying cell motility, migration, differentiation, morphology, and many other cellular function studies. Since the Qtracker® labels do not leak out of intact labeled cells and are not transferred to adjacent cells, the Qtracker® Cell Labeling kits result in a targeted signal.

Monitor the Signal on Multiple Platforms
Qtracker® reagent-labeled live cells can be easily monitored on a variety of platforms, including flow cytometry, fluorescence/confocal microscopy, fluorescence microplate readers, and high-content imaging systems.

Minimal Impact on Live Cells
The cytotoxicity of the materials used in Qtracker® Cell Labeling kits has been tested in a variety of cell lines including CHO, HeLa, U-118, 3T3, HUVEC, and Jurkat cells. Labeling with Qtracker® Cell Labeling kits appears to exert minimal impact on cellular surface marker expression, cell proliferation, cellular enzyme activity, and cell motility.

Useful in a Variety of Cell Tracing Studies
Post-labeling, researchers have demonstrated a wide variety of applications for Qtracker®-labeled cells, including cell co-culture and cell assembly into heterotypic assemblies, multilineage differentiation, trans-differentiation versus cell fusion, embryonic and mesenchymal stem cell tracking, and cell migration dynamics.

Click-iT™ Biotin sDIBO Alkyne (Invitrogen™)

Click-iT Biotin sDIBO Alkyne reacts with azides via a copper-free Click chemistry reaction to produce biotin bioconjugates. sDIBO alkynes are improved versions of our original DIBO cyclooctynes, yielding conjugates that are less “sticky” and give lower signal background in biological samples. Copper-free Click bio-conjugation reactions are ideal for surface labeling of live cells and also minimize damage to enzymes and fluorescent proteins like GFP or R-PE. Macromolecules that have been azide-modified enzymatically, chemically, or metabolically can be now be labeled easily, yielding more soluble bioconjugates with improved biological labeling utility.

• More soluble than DIBO cyclooctynes leading to more soluble conjugates
• Minimal background potential in cells and tissues compared to original DIBO cycloctynes

Learn more about avidin-biotin detection ›

Qtracker™ 565 Cell Labeling Kit (Invitrogen™)

The reagents in the Qtracker® 565 Cell Labeling Kit use a custom targeting peptide to deliver yellow-green-fluorescent Qdot® 565 nanocrystals into the cytoplasm of live cells. Qtracker® Cell Labeling Kits are designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals. Once inside the cells, Qtracker® labels provide intense, stable fluorescence that can be traced through several generations, and are not transferred to adjacent cells in a population.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

Key Attributes:

Qtracker® 565 label has Ex/Em (405-525/565) nm
Designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals
Provide intense, stable fluorescence that can be traced through several generations
Available in eight colors—525 nm, 565 nm, 585 nm, 605 nm, 625 nm, 655 nm, 705 nm, or 800 nm emission
Excellent tools for long-term tracking or imaging studies of live cells, including migration, motility, morphology, and other cell function assays

The Qtracker® Cell Labeling Kits use a custom targeting peptide to deliver Qdot® nanocrystals into the cytoplasm of live cells. Cytoplasmic delivery by this mechanism is not mediated by a specific enzyme; therefore, no cell-type specificity has been observed. Delivery is typically accomplished in less than 1 hour.

Qdot® nanocrystals delivered by the Qtracker® Cell Labeling Kits are compatible with serum-sensitive cells; intense fluorescence is maintained in complex cellular environments and under various biological conditions including changes in intracellular pH, temperature, and metabolic activity. Furthermore, autofluorescence commonly observed in cells or tissues can be avoided using Qtracker® 655, 705, or 800 Kits.

Long-Lasting, Targeted Signal
Using Qtracker® Cell Labeling Kits, you can observe labeled cells using extensive continuous illumination, without the photobleaching and degradation problems often associated with organic dyes. Qtracker® labels are distributed in vesicles in the cytoplasm, and are inherited by daughter cells for at least six generations. Fluorescence from the Qtracker® labels can be seen up to a week after delivery in some cell lines. Long-term cellular retention makes Qtracker® Cell Labeling Kits ideal for studying cell motility, migration, differentiation, morphology, and many other cellular function studies. Qtracker® labels do not leak out of intact cells to be taken up by adjacent cells in the population.

Monitor the Signal on Multiple Platforms
Qtracker® reagent-labeled live cells can be easily monitored on a variety of platforms, including flow cytometry, fluorescence/confocal microscopy, fluorescence microplate readers, and high-content imaging systems.

Minimal Impact on Live Cells
The cytotoxicity of the materials use in Qtracker® Cell Labeling Kits has been tested in a variety of cell lines including CHO, HeLa, U-118, 3T3, HUVEC, and Jurkat cells. Labeling with Qtracker® Cell Labeling Kits appears to exert minimal impact on cellular surface marker expression, cell proliferation, cellular enzyme activity, and cell motility.

Useful in a Variety of Cell Tracing Studies
Post-labeling, researchers have demonstrated a wide variety of applications for Qtracker® labeled cells, including cell co-culture and cell assembly into heterotypic assemblies, multilineage differentiation, trans-differentiation versus cell fusion, embryonic and mesenchymal stem cell tracking, and cell migration dynamics.

CellVue™ Plum Cell Labeling Kit (Invitrogen™)

CellVue™ dyes are lipophilic dyes that can be used to label the cell membrane for the purpose of identifying and tracking labeled cells. Cell labeling is rapid and stable and can be combined with fluorescently labeled antibodies and other markers of cellular function for flow cytometric analysis and fluorescent microscopy. The Mini CellVue™ Kits are supplied with one vial of dye stock (1 mM in ethanol) and one vial of labeling vehicle (Diluent C).

CellVue™ Plum is a far-red fluorescent cell labeling reagent. It is optimally excited at 652 nm and has a peak emission of 671 nm, however, it can be detected equally in filter sets designed for APC, Alexa Fluor™ 700, and APC-eFluor™ 780 or similar fluorochromes. Therefore, it is not recommended to use antibodies conjugated to these fluorochromes when using CellVue™ Plum.

Reported Application
Flow Cytometric Analysis, Microscopy, Immunocytochemistry, Cell Labeling

Click-iT™ Amine sDIBO Alkyne (Invitrogen™)

Click-iT Amine sDIBO Alkyne reacts with azides via a copper-free Click chemistry reaction to produce amine bioconjugates. sDIBO alkynes are improved versions of our original DIBO cyclooctynes, yielding conjugates that are less “sticky” and give lower signal background in biological samples. Copper-free Click bio-conjugation reactions are ideal for surface labeling of live cells and also minimize damage to enzymes and fluorescent proteins like GFP or R-PE. Macromolecules that have been azide-modified enzymatically, chemically, or metabolically can be now be labeled easily, yielding more soluble bioconjugates with improved biological labeling utility.

• More soluble than DIBO cyclooctynes leading to more soluble conjugates
• Minimal background potential in cells and tissues compared to original DIBO cycloctynes

Qtracker™ 800 Cell Labeling Kit (Invitrogen™)

The reagents in the Qtracker® 800 Cell Labeling Kit use a custom targeting peptide to deliver near-infrared-fluorescent Qdot® 800 nanocrystals into the cytoplasm of live cells. Qtracker® Cell Labeling Kits are designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals. Once inside the cells, Qtracker® labels provide intense, stable fluorescence that can be traced through several generations, and are not transferred to adjacent cells in a population.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

Key Attributes:

Qtracker® 800 label has Ex/Em (405-760/800) nm
Designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals
Provide intense, stable fluorescence that can be traced through several generations
Available in eight colors—525 nm, 565 nm, 585 nm, 605 nm, 625 nm, 655 nm, 705 nm, or 800 nm emission
Excellent tools for long-term tracking or imaging studies of live cells, including migration, motility, morphology, and other cell function assays

The Qtracker® Cell Labeling Kits use a custom targeting peptide to deliver Qdot® nanocrystals into the cytoplasm of live cells. Cytoplasmic delivery by this mechanism is not mediated by a specific enzyme; therefore, no cell-type specificity has been observed. Delivery is typically accomplished in less than 1 hour.

Qdot® nanocrystals delivered by the Qtracker® Cell Labeling Kits are compatible with serum-sensitive cells; intense fluorescence is maintained in complex cellular environments and under various biological conditions including changes in intracellular pH, temperature, and metabolic activity. Furthermore, autofluorescence commonly observed in cells or tissues can be avoided using Qtracker® 655, 705, or 800 Kits.

Long-Lasting, Targeted Signal
Using Qtracker® Cell Labeling Kits, you can observe labeled cells using extensive continuous illumination, without the photobleaching and degradation problems often associated with organic dyes. Qtracker® labels are distributed in vesicles in the cytoplasm, and are inherited by daughter cells for at least six generations. Fluorescence from the Qtracker® labels can be seen up to a week after delivery in some cell lines. Long-term cellular retention makes Qtracker® Cell Labeling Kits ideal for studying cell motility, migration, differentiation, morphology, and many other cellular function studies. Qtracker® labels do not leak out of intact cells to be taken up by adjacent cells in the population.

Monitor the Signal on Multiple Platforms
Qtracker® reagent-labeled live cells can be easily monitored on a variety of platforms, including flow cytometry, fluorescence/confocal microscopy, fluorescence microplate readers, and high-content imaging systems.

Minimal Impact on Live Cells
The cytotoxicity of the materials use in Qtracker® Cell Labeling Kits has been tested in a variety of cell lines including CHO, HeLa, U-118, 3T3, HUVEC, and Jurkat cells. Labeling with Qtracker® Cell Labeling Kits appears to exert minimal impact on cellular surface marker expression, cell proliferation, cellular enzyme activity, and cell motility.

Useful in a Variety of Cell Tracing Studies
Post-labeling, researchers have demonstrated a wide variety of applications for Qtracker® labeled cells, including cell co-culture and cell assembly into heterotypic assemblies, multilineage differentiation, trans-differentiation versus cell fusion, embryonic and mesenchymal stem cell tracking, and cell migration dynamics.

CellTracker™ Orange CMTMR Dye (Invitrogen™)

CellTracker™ Orange CMTMR (5-(and-6)-(((4-chloromethyl)benzoyl)amino)tetramethylrhodamine) (mixed isomers) is a fluorescent dye well suited for monitoring cell movement or location. This dye is well retained, allowing for multigenerational tracking of cellular movements. And the orange excitation/emission spectra are ideal for multiplexing with green fluorescent dyes and proteins.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

• Easy to use—remove medium, add dye, incubate 30 minutes, and image cells
• Fluorescent signal retention of >72 hours (typically three to six generations)
• Orange excitation/emission spectra (541/565 nm maxima) ideal for multiplexing
• Low cytotoxicity—does not affect viability or proliferation

CellTracker™ Orange CMTMR fluorescent dye has been designed to freely pass through cell membranes into cells, where it is transformed into cell membrane-impermeant reaction products. CellTracker™ Orange CMTMR dye is retained in living cells through several generations. The dye is transferred to daughter cells, but not adjacent cells in a population. CellTracker™ Orange CMTMR dye is designed to display fluorescence for at least 72 hours, and the dye exhibits ideal tracking properties: it is stable, nontoxic at working concentrations, well retained in cells, and brightly fluorescent at physiological pH. Additionally, the excitation and emission spectra of CellTracker™ Orange CMTMR dye are well separated from GFP (green fluorescent protein) and spectra allowing for multiplexing.

Qtracker™ 525 Cell Labeling Kit (Invitrogen™)

The reagents in the Qtracker® 525 Cell Labeling Kit use a custom targeting peptide to deliver green-fluorescent Qdot® 525 nanocrystals into the cytoplasm of live cells. Qtracker® Cell Labeling Kits are designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals. Once inside the cells, Qtracker® labels provide intense, stable fluorescence that can be traced through several generations, and are not transferred to adjacent cells in a population.

Need a different emission spectrum or longer tracking? View our other mammalian cell tracking products.

Key Attributes:

Qtracker® 525 label has Ex/Em (405-485/525) nm
Designed for loading cells grown in culture with highly fluorescent Qdot® nanocrystals
Provide intense, stable fluorescence that can be traced through several generations
Available in eight colors—525 nm, 565 nm, 585 nm, 605 nm, 625 nm, 655 nm, 705 nm, or 800 nm emission
Excellent tools for long-term tracking or imaging studies of live cells, including migration, motility, morphology, and other cell function assays

The Qtracker® Cell Labeling Kits use a custom targeting peptide to deliver Qdot® nanocrystals into the cytoplasm of live cells. Cytoplasmic delivery by this mechanism is not mediated by a specific enzyme; therefore, no cell-type specificity has been observed. Delivery is typically accomplished in less than 1 hour.

Qdot® nanocrystals delivered by the Qtracker® Cell Labeling Kits are compatible with serum-sensitive cells; intense fluorescence is maintained in complex cellular environments and under various biological conditions including changes in intracellular pH, temperature, and metabolic activity. Furthermore, autofluorescence commonly observed in cells or tissues can be avoided using Qtracker® 655, 705, or 800 Kits.

Long-Lasting, Targeted Signal
Using Qtracker® Cell Labeling Kits, you can observe labeled cells using extensive continuous illumination, without the photobleaching and degradation problems often associated with organic dyes. Qtracker® labels are distributed in vesicles in the cytoplasm, and are inherited by daughter cells for at least six generations. Fluorescence from the Qtracker® labels can be seen up to a week after delivery in some cell lines. Long-term cellular retention makes Qtracker® Cell Labeling Kits ideal for studying cell motility, migration, differentiation, morphology, and many other cellular function studies. Qtracker® labels do not leak out of intact cells to be taken up by adjacent cells in the population.

Monitor the Signal on Multiple Platforms
Qtracker® reagent-labeled live cells can be easily monitored on a variety of platforms, including flow cytometry, fluorescence/confocal microscopy, fluorescence microplate readers, and high-content imaging systems.

Minimal Impact on Live Cells
The cytotoxicity of the materials use in Qtracker® Cell Labeling Kits has been tested in a variety of cell lines including CHO, HeLa, U-118, 3T3, HUVEC, and Jurkat cells. Labeling with Qtracker® Cell Labeling Kits appears to exert minimal impact on cellular surface marker expression, cell proliferation, cellular enzyme activity, and cell motility.

Useful in a Variety of Cell Tracing Studies
Post-labeling, researchers have demonstrated a wide variety of applications for Qtracker® labeled cells, including cell co-culture and cell assembly into heterotypic assemblies, multilineage differentiation, trans-differentiation versus cell fusion, embryonic and mesenchymal stem cell tracking, and cell migration dynamics.

CellTrace™ Calcein Red-Orange, AM - Special Packaging (Invitrogen™)

CellTrace calcein red-orange AM is a cell-permeant dye that can be used to determine cell viability in most eukaryotic cells. Unlike calcein AM (C-1430, C-3099, C-3100), CellTrace calcein red-orange AM is intrinsically fluorescent; thus, an additional wash step may be necessary to minimize background fluorescence from dye that is not taken up by cells. However, CellTrace calcein red-orange (excitation/emission maxima 577/590 nm) is well-retained by live cells that possess intact plasma membranes, and consequently it is a useful cell tracer and indicator of cell viability.

CellVue™ Burgundy Cell Labeling Kit (Invitrogen™)

CellVue™ dyes are lipophilic dyes that can be used to label the cell membrane for the purpose of identifying and tracking labeled cells. Cell labeling is rapid and stable and can be combined with fluorescently labeled antibodies and other markers of cellular function for flow cytometric analysis and fluorescent microscopy. The Mini CellVue™ Kits are supplied with one vial of dye stock (1 mM in ethanol) and one vial of labeling vehicle (Diluent C).

CellVue™ Burgundy is a far-red/near-infrared fluorescent cell labeling reagent. It is optimally excited at 683 nm and has a peak emission of 707 nm. CellVue™ Burgundy can be excited by the red laser line (633 nm), however, it can be detected equally in filter sets designed for Alexa Fluor™ 700 and APC-eFluor™ 780 or similar fluorochromes. Therefore, it is not recommended to use antibodies conjugated to these fluorochromes when using CellVue™ Burgundy. CellVue™ Burgundy can be used in combination with APC.

Reported Application
Flow Cytometric Analysis, Microscopy, Immunocytochemistry, Cell Labeling

Click-iT™ Plus OPP Alexa Fluor™ 488 Protein Synthesis Assay Kit (Invitrogen™)

The Click-iT® Plus OPP Alexa Fluor® 488 Protein Synthesis Assay Kit provides a fast, sensitive, and non-radioactive method for the detection of protein synthesis using fluorescence microscopy or high-content imaging. In this assay O-propargyl-puromycin (OPP) is efficiently incorporated into newly translated proteins in complete methionine-containing media and fluorescently labeled with a bright, photostable Alexa Fluor® dye in a fast, highly-specific, and mild click reaction.

Features of the kit include:

• No media change required—works in complete, methionine-containing media, no need to remove cell media
• Multiplex-enabled—Click-iT® Plus technology retains signal from GFP and binding of fluorescent-conjugated phalloidins
• Non-radioactive—an alternative to the traditional 35S-methionine methods
• Works in vivo—published results demonstrate use in vivo for determination of protein translation

The kit contains O-propargyl-puromycin (OPP), which is an alkyne analog of puromycin (also available separately), as well as Alexa Fluor® 488 picolyl azide and all necessary reagents to perform the Click reaction. The OPP is fed to cultured cells and incorporated into proteins during active protein synthesis. Addition of the Alexa Fluor® 488 picolyl azide and the Click reaction reagents leads to a chemoselective ligation, or "click" reaction, between the picolyl azide dye and the OPP alkyne, allowing the modified proteins to be detected by imaged-based analysis.

The click reaction uses bioorthogonal (biologically unique) moieties to fluorescently label proliferating cells, helping produce low backgrounds and high detection sensitivities. Because of the mild reaction conditions, Click-iT® Plus assays detect protein translation events while enabling the preservation of cell morphology, the binding of fluorescently-labeled phalloidin, and the fluorescent signal from GFP.

Unlike 35S-methionine, used in traditional methods, OPP is not an amino acid analog, so it can be added directly to cells in complete media or used to determine protein synthesis in vivo.

The kit contains all of the components needed to label and detect the incorporated OPP in newly translated proteins in samples of adherent cells. The kit includes sufficient reagents for the labeling of 25 18 mm × 18 mm coverslips using 1 mL of reaction buffer per test.