- The Drosophila inhibitor of apoptosis (IAP) DIAP2 is dispensable for cell survival, required for the innate immune response to gram-negative bacterial infection, and can be negatively regulated by the reaper/hid/grim family of IAP-binding apoptosis inducers. Huh, J.R., Foe, I., Muro, I., Chen, C.H., Seol, J.H., Yoo, S.J., Guo, M., Park, J.M., Hay, B.A. J. Biol. Chem. (2007)