Description: This AMS-32.1 monoclonal antibody reacts with the mouse MHC Class II I-Ad alloantigen, which is present on mouse strains such as Balb/c and DBA/2. This antibody also recognizes the H-2f, H-2g7, H-2i, and H-2v haplotypes. However, reactivity to other haplotypes (e.g., b, k, p, q, r, s, and u) has not been observed.