Cytokine that binds to TNFRSF10A/TRAILR1, TNFRSF10B/TRAILR2, TNFRSF10C/TRAILR3, TNFRSF10D/TRAILR4 and possibly also to TNFRSF11B/OPG (PubMed:26457518, PubMed:10549288). Induces apoptosis. Its activity may be modulated by binding to the decoy receptors TNFRSF10C/TRAILR3, TNFRSF10D/TRAILR4 and TNFRSF11B/OPG that cannot induce apoptosis. Homotrimer (PubMed:26457518). One TNFSF10 homotrimer interacts with three TNFSF10A mononers (PubMed:26457518). One TNFSF10 homotrimer interacts with three TNFSF10B mononers (PubMed:10549288). Exists both as membrane-bound and soluble form. Widespread; most predominant in spleen, lung and prostate. Tyrosine phosphorylated by PKDCC/VLK. Induced upon HIV infection, antagonizes signaling via TRAIL receptor R2 (TNFRSF10B). Belongs to the tumor necrosis factor family.