該基因是凋亡抑制因子（IAP）基因家族的成員，其編碼抑制凋亡細胞死亡的負調節蛋白。IAP家族成員通常包含多個桿狀病毒IAP重復序列（BIR）域，但該基因僅編碼一個BIR域的蛋白質。編碼蛋白也缺乏C端環指結構域。在胎兒發育和大多數腫瘤中基因表達較高，而在成人組織中表達較低。另外，還發現了編碼該基因不同亞型的剪接轉錄變體。
This gene is a member of the inhibitor of apoptosis (IAP) gene family, which encode negative regulatory proteins that prevent apoptotic cell death. IAP family members usually contain multiple baculovirus IAP repeat (BIR) domains, but this gene encodes proteins with only a single BIR domain. The encoded proteins also lack a C-terminus RING finger domain. Gene expression is high during fetal development and in most tumors, yet low in adult tissues. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene.