Donkey anti-rat IgG (H&L), FITC (fluorescein-5-isothiocyanate) conjugated, is a secondary antibody which binds to rat IgGs in immunological assays. FITC has Amax = 494 nm, Emax = 518 nm. Fluor to protein ratio is 3-7 moles FITC per mole antibody. Antibodies are adsorbed against bovine, chicken, goat, guinea pig, hamster, horse, human, mouse, rabbi, sheep IgG and affinity purified using solid phase rat IgG.