Human B- and T-lymphocyte attenuator (BTLA)-Fc fusion protein, also known as CD272, GenBank Accession No. NM_181780, a.a. 31-150, expressed in a HEK293 cell expression system. MW = 40.3 kDa (monomer). This protein runs at a higher apparent M.W. by SDS-PAGE due to glycosylation.