Human secreted programmed_x000D_ cell death 1 (PD-1) also known as PDCD1,_x000D_ SLEB2, CD279 and HPD-L, GenBank_x000D_ Accession No. NM_005018, a.a 25-167,_x000D_ fused at the C-terminus to the Fc portion of_x000D_ human IgG1, Eu-labeled, expressed in a_x000D_ HEK293 cell expression system. MW = 43_x000D_ kDa.