Human CD70, also known as CD70 antigen, Tumor Necrosis Factor Ligａnd Superfamily Member 7, TNFSF7, CD27 Ligand, Ki-24 antigen, CD27-L, and CD27LG, GenBank Accession No. NM_001252, a.a. 39-193 with N-terminal His-tag, expressed in a HEK293 cell expression system. MW = 19.7 kDa. This protein runs at a higher MW by SDS-PAGE due to glycosylation.