This gene encodes a protein localized to the nucleus in proliferating cells. Expression of this gene is modulated by cytokines in natural killer and T cells. The gene product is thought to play a role in apoptosis but the specific role has not yet been determined. Two transcripts encoding different isoforms have been identified. Alternative names: H731; MGC33046; MGC33047; Neoplastic transformation inhibitor; Neoplastic transformation inhibitor protein; Nuclear antigen H731; Nuclear antigen H731 like; Nuclear antigen H731 like protein; OTTHUMP00000020483; PDCD 4; Programmed cell death 4; programmed cell death 4 (neoplastic transformation inhibitor) ; Programmed cell death protein 4; Protein 197/15a ; RP11 348N5.4 .