Shop All Stains and Dyes

Richard-Allan Scientific™ May-Grunwald Stain, bottle Thermo Scientific™

Produce very dense color saturation with Thermo Scientific™ Richard-Allan Scientific™ May-Grunwald Stain, a classical hematology stain

Remel™ Trichrome Blue, 250 mL bottle Thermo Scientific™

Thermo Scientific™ Remel Trichrome Blue is for detection of Microsporidium in clinical specimens.

Richard-Allan Scientific™ Reticulocyte Stain Thermo Scientific™

Identify immature erythrocytes with Thermo Scientific™ Richard-Allan Scientific™ Reticulocyte Stain, a specialized hematology stain

Remel™ Trichrome Stain Kit Thermo Scientific™

Thermo Scientific™ Remel Trichrome Stain Kit is used for trichrome staining.

Richard-Allan Scientific™ Jenner Stain, bottle Thermo Scientific™

Achieve results similar to that of a Giemsa stain with Thermo Scientific™ Richard-Allan Scientific™ Jenner Stain.

Rhod-FF, AM, cell permeant - Special Packaging Invitrogen™

Labeled calcium indicators are molecules that exhibit an increase in fluorescence upon binding Ca2+. They have uses in many calcium signaling investigations, including measuring Ca2+ in cells and tissues that have high levels of autofluorescence and also for detecting Ca2+ release generated by photoreceptors and photoactivatable chelators. Cells may be loaded with the AM ester forms of these calcium indicators by adding the dissolved indicator directly to dishes containing cultured cells. The fluorescence signal from these cells is generally measured using fluorescence microscopy.

Learn more about ion indicators including calcium, potassium, pH, and membrane potential indicators ›

Calcium Indicator (AM Ester) Specifications:
• Label (Ex/Em of Ca2+–bound form): Rhod-FF (552/580 nm)
• Fluorescence intensity increase upon binding Ca2+: >100 fold
• Kd for Ca2+ in the absence of Mg2+, in buffer: ~19 µM
• Exhibit fluorescence increase upon binding Ca2+ with little shift in wavelength

Using TPEN to Control Heavy Metal Cations
In addition, BAPTA-based indicators such as these bind various heavy metal cations (e.g., Mn2+, Zn2+, Pb2+) with substantially higher affinity than Ca2+. Perturbations to calcium measurements caused by presence of these ions can be controlled using the heavy metal-selective chelator TPEN.

More Choices for Fluorescent Calcium Indicators
We offer a large selection of Molecular Probes® calcium indicators for use in various experimental scenarios, for example dextran versions for reduced leakage and compartmentalization and BAPTA conjugates for detecting high-amplitude calcium transients. For more information, review Fluorescent Ca2+ Indicators Excited with Visible Light—Section 19.3 in the Molecular Probes® Handbook.

For UV-excitable Ca2+ indicators, protein-based Ca2+ indicators, conjugates of Ca2+ indicators, and for fluorescence-based indicators of other metal ions (i.e., Mg2+, Zn2+) review Indicators for Ca2+, Mg2+, Zn2+ and Other Metal Ions—Chapter 19 in the Molecular Probes® Handbook.

For Research Use Only. Not for human or animal therapeutic or diagnostic use.

Shandon™ Gill™ Hematoxylin Thermo Scientific™

Achieve fast and convenient results, while maintaining complete control over stain intensity with Thermo Scientific™ Shandon™ Gill™ Hematoxylin, which has mucoid staining.

Remel™ Trichrome Quick Stain Kit Thermo Scientific™

Thermo Scientific™ Remel Trichrome Quick Stain Kit is for use with mercury-free transports.

SNARF™-1 Carboxylic Acid, Acetate, Succinimidyl Ester - Special Packaging Invitrogen™

To permit simultaneous long-term tracing of mixed-cell populations using different fluorescent colors, we have developed a probe whose applications should be similar to those of CFDA SE (commonly called CFSE). Cells labeled with our SNARF-1 carboxylic acid, acetate, succinimidyl ester have orange-red fluorescence that can be easily distinguished from that of cells loaded with green-fluorescent tracers such as CFDA SE.

Learn more about ion indicators including calcium, potassium, pH, and membrane potential indicators ›

eBioscience™ Propidium Iodide Invitrogen™

Propidium Iodide (PI) is a standard reagent used for assessing cell viability and exclusion of non-viable cells in flow cytometry. PI binds to double stranded DNA, but is excluded from cells with intact plasma membranes. PI should be analyzed in the PE channel when used as a counterstain for Annexin V FITC. 7-AAD can be used in place of PI when using Annexin V PE. The advantage of 7-AAD over PI is that there is minimal spectral overlap between these emissions. Choose propidium Iodide as a counterstain with Annexin V apoptosis assays.

Human, Mouse, Rat

Shandon™ Tissue-Marking Dyes Thermo Scientific™

Permanently mark the margins of excised surgical specimens for exact orientation with Thermo Scientific™ Shandon™ Tissue-Marking Dyes.

RA Lamb Dry Dyes Thermo Scientific™

Ensure batch-to-batch consistency with Thermo Scientific™ RA Lamb Dry Dyes, which are manufactured using strictly controlled processing procedures.

eBioscience™ Human Regulatory T Cell Whole Blood Staining Kit Invitrogen™

This Human Regulatory T Cell Whole Blood Staining Kit contains the buffers and monoclonal antibody necessary to successfully stain and identify Foxp3 cells in whole blood samples. The PCH101 monoclonal antibody reacts with the amino terminus of human Foxp3 also known as FORKHEAD BOX P3, SCURFIN, and JM2. Foxp3 is a 49-55 kDa protein and a member of the forkhead/winged-helix family of transcription factors. It was identified as the gene responsible for the X-linked lymphoproliferative disease observed in scurfy (sf) mice and in the human disorder, X-linked autoimmunity-allergic dysregulation syndrome (XLAAD). Constitutive expression of Foxp3 mRNA has been shown in CD4+CD25+ regulatory T cells (Treg), and ectopic expression of Foxp3 in CD4+CD25- cells imparts a Treg phenotype in these cells.

The PCH101 antibody crossreacts with rhesus, chimpanzee, and cynomolgus Foxp3 PCH101 recognizes a different epitope of Foxp3 than clones 236A/E7 and 150D/E4.


IgG2a, kappa


Reported Application
Intracellular Staining Followed by Flow Cytometric Analysis

5-(and-6)-Carboxy SNARF™-1, Acetoxymethyl Ester, Acetate Invitrogen™

Carboxy SNARF®-1, acetoxymethyl ester, acetate is a cell-permeant pH indicator that has a pKa of ~7.5 after de-esterification; thus, it is useful for measuring pH changes between pH 7 and pH 8. Carboxy-SNARF®-1 exhibits a significant pH-dependent emission shift from yellow-orange to deep red fluorescence under acidic and basic conditions, respectively. This pH dependence allows the ratio of the fluorescence intensities from the dye at two emission wavelengths - typically 580 nm and 640 nm - to be used for quantitative determinations of pH.

Dextran, Texas Red™, 10,000 MW, Neutral Invitrogen™

Labeled dextrans are hydrophilic polysaccharides most commonly used in microscopy studies to monitor cell division, track the movement of live cells, and to report the hydrodynamic properties of the cytoplasmic matrix. The labeled dextran is commonly introduced into the cells via microinjection.

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

Dextran Specifications:

Label (Ex/Em): Texas Red® (595/615)
Size: 10,000 MW
Charge: Zwitterionic
Fixable: Nonfixable

High Manufacturing Standards of Molecular Probes® Dextrans
We offer more than 50 fluorescent and biotinylated dextran conjugates in several molecular weight ranges. Dextrans are hydrophilic polysaccharides characterized by their moderate-to-high molecular weight, good water solubility, and low toxicity. They also generally exhibit low immunogeniticy. Dextrans are biologically inert due to their uncommon poly-(α-D-1,6-glucose) linkages, which render them resistant to cleavage by most endogenous cellular glycosidases.

In most cases, Molecular Probes® fluorescent dextrans are much brighter and have higher negative charge than dextrans available from other sources. Furthermore, we use rigorous methods for removing as much unconjugated dye as practical, and then assay our dextran conjugates by thin-layer chromatography to help ensure the absence of low molecular weight contaminants.

A Wide Selection of Substituents and Molecular Weights
Molecular Probes® dextrans are conjugated to biotin or a wide variety of fluorophores, including seven of our Alexa Fluor® dyes (Molecular Probes dextran conjugates–Table 14.4) and are available in these nominal molecular weights (MW): 3,000; 10,000; 40,000; 70,000; 500,000; and 2,000,000 daltons.

Dextran Net Charge and Fixability
We employ succinimidyl coupling of our dyes to the dextran molecule, which, in most cases, results in a neutral or anionic dextran. The reaction used to produce the Rhodamine Green™ and Alexa Fluor® 488 dextrans results in the final product being neutral, anionic, or cationic. The Alexa Fluor®, Cascade Blue®, lucifer yellow, fluorescein, and Oregon Green® dextrans are intrinsically anionic, whereas most of the dextrans labeled with the zwitterionic rhodamine B, tetramethylrhodamine, and Texas Red® dyes are essentially neutral. To produce more highly anionic dextrans, we have developed a proprietary procedure for adding negatively charged groups to the dextran carriers; these products are designated "polyanionic" dextrans.

Some applications require that the dextran tracer be treated with formaldehyde or glutaraldehyde for subsequent analysis. For these applications, we offer "lysine-fixable" versions of most of our dextran conjugates of fluorophores or biotin. These dextrans have covalently bound lysine residues that permit dextran tracers to be conjugated to surrounding biomolecules by aldehyde-mediated fixation for subsequent detection by immunohistochemical and ultrastructural techniques. We have also shown that all of our 10,000 MW Alexa Fluor® dextran conjugates can be fixed with aldehyde-based fixatives.

Key Applications Using Labeled Dextrans
There are a multitude of citations describing the use of labeled dextrans. Some of the most common uses include:

Neuronal tracing (anterograde and retrograde) in live cells
Cell lineage tracing in live cells
Neuroanatomical tracing
Examining intercellular communications (e.g., in gap junctions, during wound healing, and during embryonic development)
Investigating vascular permeability and blood–brain barrier integrity
Tracking endocytosis
Monitoring acidification (some dextran–dye conjugates are pH-sensitive)
Studying the hydrodynamic properties of the cytoplasmic matrix

For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.
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