Anti-Fluorescein/Oregon Green®, Rabbit IgG Fraction, Alexa Fluor® 594 Conjugate can be used to convert the green-fluorescent signal of the fluorescein or Oregon Green® hapten with the superior photostability and red fluorescence of the Alexa Fluor® 594 dye. This antibody also enables the use of fluorescein or Oregon Green® dyes as haptens instead of biotin. Unlike biotin, which is an endogenous ligand in mitochondria, dye-based haptens permit background-free staining of cells and tissues and a sensitive alternative to biotin-streptavidin methods for ELISAs.