CAAP1, or caspase activity and apoptosis inhibitor 1, is a family of eukaryotic proteins involved in the regulation of apoptosis. It modulates a caspase-10 dependent mitochondrial caspase-3/9 feedback amplification loop.

1: Identification of a conserved anti-apoptotic protein that modulates the mitochondrial apoptosis pathway. Zhang Y, Johansson E, Miller ML, Janicke RU, Ferguson DJ, Plas D, Meller J, Anderson MW; PLoS One. 2011;6:e25284. PMID:21980415