tumor necrosis factor ligand superfamily member 13 (human) tumor necrosis factor ligand superfamily member 13 isoforms alpha/beta/gamma/4/5 (human) Category=organism-seqgroup. tumor necrosis factor ligand superfamily member 13 isoform alpha (human) tumor necrosis factor ligand superfamily member 13 isoform beta (human) tumor necrosis factor ligand superfamily member 13 isoform gamma (human) tumor necrosis factor ligand superfamily member 13 isoform 4 (human) tumor necrosis factor ligand superfamily member 13 isoform 5 (human)