title: The ultrastructure of a hitherto unrecognized gland, the cephalic gland in the head of Orconectes limosus which produces ecdysteroids.
mesh_terms: D000375:Aging; D000818:Animals; D003400:Astacoidea / Q000254:growth & development / Q000502:physiology*; D002843:Chromatin / Q000648:ultrastructure; D007447:Invertebrate Hormones / Q000378:metabolism*; D009424:Nervous System Physiological Phenomena; D009799:Ocular Physiological Phenomena; D012627:Sebaceous Glands / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure*
chemical_list: D002843:Chromatin; D007447:Invertebrate Hormones