FREE Sample - RTU Animal-Free Block and Diluent Convenient for IHC with multiple species of antibodies •Antibody diluent stabilizes diluted antibody solutions •Blocking reagent diminishes background due to non-specific binding in IHC applications •Plant-based alternative to sera, BSA, NFDM •Especially convenient in multiplex IHC (multiple antigen labeling) where several different antibody species are used. Prostate without and with R.T.U. Animal Free Block and Diluent used in the blocking step. Both sections are no primary antibody controls with Biotinylated Universal Secondary Antibody, VECTASTAIN® Elite® ABC, and ® Vector DAB Substrate for detection. Note significant toning in section without RTU Animal Free Block and Diluent.