Both the epithelial cells and the nerve cells are involved in the head inhibition properties in Hydra attenuata.
D000818:Animals; D002678:Chimera; D004848:Epithelium / Q000502:physiology; D005121:Extremities / Q000502:physiology; D006257:Head / Q000502:physiology; D006829:Hydra / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D009474:Neurons / Q000502:physiology; D012038:Regeneration; D013270:Stomach / Q000502:physiology; D014184:Transplantation, Homologous