Goat anti-rat IgG (H&L), F(ab)'2 fragment, biotin conjugated, is F(ab)'2 fragment, of a biotinylated secondary antibody which binds to all rat IgGs in immunological assays. Antibody is adsorbed against human,mouse IgG and affinity purified on solid phase rat IgG. Antibody purity is >90% based on SDS-PAGE. Antibody solution may contain small amounts of intact IgG.