Browse our comprehensive portfolio of validated, conjugated and unconjugated secondary antibodies for fluorescent—including Alexa Fluor antibodies—colorimetric, and chemiluminescent detection of primary antibodies in a wide range of applications, such as cell imaging, flow cytometry and western blotting. We offer 18 different individual Invitrogen Alexa Fluor dyes and 4 Alexa Fluor tandem dyes conjugated to secondary antibodies.

CiteAb award for Invitrogen secondary antibodies

At Thermo Fisher Scientific we are proud to receive this award for our Invitrogen secondary antibodies.
CiteAb, in awarding this distinction, looked for the company with the most secondary antibody citations from 2018 data.

Secondary antibody selection table

Reactivity Non fluorescent conjugates Fluorescent conjugates Target Ig class
NEW Alexa Fluor Plus Secondary Antibodies — an innovation in secondary antibodies offering higher signal-to-noise ratio for your precious samples.

Popular secondary antibody products

Related secondary antibodies applications

Western blot reagents and instruments, chemiluminescent, colorimetric, and fluorescent detection substrates, blocking buffers, and secondary antibody conjugates

We offer a wide selection of ELISA kits targeted to disease-related proteins for research in immunology, cancer, neurodegeneration, stem cells, and more.

Reagents and kits for cellular imaging applications such as fluorescence microscopy, IHC, ISH, HCS, LCM, and small animal in vivo imaging

Antibodies, cell functional reagents, Invitrogen Attune flow cytometer, and instrument calibration products

Molecular Probes School of Fluorescence

Molecular Probes School of Fluorescence

Everyone starting out in fluorescence imaging has questions. Learn the fundamentals of fluorescence microscopy, including sample and media considerations, sample preparation, and beginner’s protocols to help you get started. We hope you will benefit from the information in Molecular Probes School of Fluorescence.

Get the basics