PACAP Receptors Co-immunoprecipitation tests demonstrated Bim, however, not Poor, Puma, bak or tBid, to become bound to Mcl1, Bcl-2 and Bcl-xL, further supporting the idea that they harbor endogenous activator BH3 proteins sequestered to pro-survival associates to avoid apoptosis (Body 3B) tuskonus October 10, 2021