http://www.cd-bioparticles.com/p/Fluorophore-Gold-Nanoparticles_258_259_271_3096.html40 nm fluorophore labeled spherical gold nanoparticles. The fluorophore can be IRDye 800, Alexa Fluor 750, Alexa Fluor 680, Cy5.5, Alexa Fluor 647, Cy5, Alexa Fluor 633, Alexa Fluor 594, Texas Red, Alexa Fluor 546, Alexa Fluor 555, FITC and Alexa Fluor 488. These nanoparticles are available with the following active groups or ligands: amine, biotin, carboxyl, maleimide, methyl, neutravidin, NHS, streptavidin, MUTAB, protein A and secondary antibodies.