Cytochrome c is a critical regulator of apoptosome assembly, caspase activation, and programmed cell death. Recent work demonstrates that cytochrome c and caspases function in Drosophila sperm cell differentiation and indicates that caspase activity can be regulated in a subcellular manner in cells that live.
Baehrecke, E. H. (2003). Caspase activation finds fertile ground. Developmental Cell. https://doi.org/10.1016/S1534-5807(03)00134-5