Fluorescence Dye 700-I with Streptavidin conjugate. In comparison with Alexa Fluor 700, Fluorescence Dye 700-I are brighter with stronger absorption at 633nm. Fluorescence emission of Fluorescence Dye 700-I is well separated from that of other commonly used red fluorophores, such as TAMRA, Fluorescent Dye 647-I and R-phycoerythrin, making it ideal for multi-color labeling.