Human secreted programmed cell death 1 (PD-1)-Fc fusion protein, also known as, PDCD1, SLEB2, CD279, HPD-L, PD-1 Biotin-labeled GenBank Accession No. NM_005018, a.a 25-167, fused at the C-terminus to the Fc portion of human IgG1, with C-terminal Avitag ™ expressed in a HEK293 cell expression system and enzymatically biotinlabeled using Avi-tag™ technology. MW = 44.5 kDa. This protein runs at a higher M.W. by SDS-PAGE due to glycosylation.