– B-lymphocyte-specific membrane protein that plays a role in the regulation of cellular calcium influx necessary for the development, differentiation, and activation of B-lymphocytes. Functions as a store-operated calcium (SOC) channel component promoting calcium influx after activation by the B-cell receptor/BCR. CD20 Protein, Mouse, Recombinant (His) is expressed in yeast with N-6xHis tag. The predicted molecular weight is 22.3 kDa and the accession number is P19437.