Yama/ CPP32 beta, a mammalian homolog of CED-3, is a Crm A - inhitable proteases that cleaves the death substrate poly (ADP ribose) polymerase. - Tewari,M.; Quan,L.T.; Rourke,K.O.; Desnoyers,S.; Zeng,Z.; Beidler,D.R. (Cell, 1995)