IAPs block apoptotic events induced by caspase-8 and cytochrome c by direct inhibition of distinct caspases. - Deveraux,O.L.; Roy,N.; Stennicke,H.R.; Van Arsdale,T.; Zhou,Q.; Srinivasula,S.M.; Alnemri,E.S.; Salvesen,G.S.; Reed,J.C. (EMBO J, 1998)