MHC Class II (I-Ab) VHH-8His-Cys-tag Recombinant Monoclonal Antibody for ICC/IF, Flow I-Ab (H2-Ab1, histocompatibility 2, class II antigen A, beta 1) is an MHC class II heterodimer molecule of non-covalently associated alpha (31-34 kDa) and beta (26-29 k