The exception proves the rule--findings of a histological study of neuroendocrine centres of anomalous first instar nymphs of cockroach Periplaneta americana (L.).
D000818:Animals; D003058:Cockroaches / Q000502:physiology*; D004702:Endocrine Glands / Q000166:cytology / Q000502:physiology*; D009420:Nervous System / Q000166:cytology; D009424:Nervous System Physiological Phenomena; D009758:Nymph / Q000502:physiology