Caspase cleaved BID targets mitochondria and is required for cytochrome c release, while BCL-XL prevents this release but not tumor necrosis factor-R1/Fas death - Gross, A; Yin, X M; Wang, K; Wei, M C; Jockel, J; Milliman, C; Erdjument-Bromage, H; Tempst, P; Korsmeyer, S J (J Biol Chem, 1999)