B2M is a component of MHC class I complexes that present peptide antigens to the immune system. B2M/Beta-2-microglobulin Protein, Human (HEK293, His) is the recombinant human-derived B2M/Beta-2-microglobulin protein, expressed by HEK293 , with C-6*His labeled tag. The total length of B2M/Beta-2-microglobulin Protein, Human (HEK293, His) is 99 a.a., with molecular weight of ~14.0 kDa.