Immunological processes influence the development and vitality of every organism. The tobacco hornworm, Manduca sexta, is one such invertebrate insect whose hemocytes, which are blood cells, play a role in phagocytosis of foreign molecules when they encounter damaged tissue or infection. Tissue damage caused by x-ray irradiation causes developmental delay in M. sexta (Fuse Lab, unpublished data). I study these effects during wing development precursor cell regeneration.