Cytokine that binds to TNFRSF13B/TACI and to TNFRSF17/BCMA. Plays a role in the regulation of tumor cell growth. May be involved in monocyte/macrophage-mediated immunological processes. . This is the function of TNFSF13 (TNF superfamily member 13, Ensembl gene identifier ENSG00000161955).