Jackson Immuno Research Inc.
specializing in secondary antibodies and conjugates
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Whole IgG Affinity-Purified Secondary Antibodies

"I have used a wide variety of secondaries and Jackson ImmunoResearch has consistently been the best. The fluorophores are bright and stable and their selective (x reactivity removed) secondaries have always shown species specificity in multiple labeling."

Janet Duerr, Ohio University

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Cyanine, Cy2

Cyanine, Cy™2 Technical Information

Cy™2 - conjugates have maximum absorption/excitation at 492 nm and fluoresce with a peak around 510 nm in the green region of the visible spectrum like FITC conjugates (520 nm), but they are more photostable and less sensitive to pH changes than FITC. The main advantage of Cy™2 conjugates is increased fluorescence in plastic mounting media compared with other green-fluorescing dyes.

Cy2 is available conjugated to:

Excitation Peak (nm) Emission Peak (nm)
Cyanine, Cy2 492 510

Caution: Cy2 is sensitive to p-phenylenediamine, an anti-fading agent found in some aqueous mounting media, which results in weak and diffused fluorescence after storage of stained slides.

Cy2 Conjugated Antibodies

Control Reagents Product Code
Cy2-conjugated ChromPure Donkey IgG, whole molecule 017-220-003
Cy2-conjugated ChromPure Goat IgG, whole molecule 005-220-003
Streptavidin Product Code
Cy2-conjugated Streptavidin 016-220-084

Spectra Viewer

Use the spectra viewer below to compare Cy2 with other fluorophores, along with instrument specifics (laser/filter) for suitability in your assay.

  Show Excitation and Emission Spectra  

  • Cy™ is a trademark of GE Healthcare Bio-Sciences Ltd.