Human CD40L, T cell antigen Gp39, TNF related activation protein, TRAP, tumor necrosis factor ligand superfamily member 5, TNFSF5, CD154. GenBank Accession No. NM_000074, a.a. 116-261 with an N-terminal His-tag, expressed in a HEK293 cell expression system. MW = 18.4 kDa.