Brain and gut.
D000324:Adrenocorticotropic Hormone / Q000502:physiology; D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000502:physiology*; D004068:Digestive System Physiological Phenomena; D004723:Endorphins / Q000502:physiology; D005768:Gastrointestinal Hormones / Q000502:physiology; D006728:Hormones / Q000502:physiology*; D008550:Melatonin / Q000502:physiology; D009474:Neurons / Q000502:physiology; D009496:Neurotensin / Q000502:physiology; D010455:Peptides / Q000502:physiology*; D012701:Serotonin / Q000502:physiology; D013004:Somatostatin / Q000502:physiology; D013373:Substance P / Q000502:physiology
D004723:Endorphins; D005768:Gastrointestinal Hormones; D006728:Hormones; D010455:Peptides; D012701:Serotonin; D013373:Substance P; D009496:Neurotensin; D013004:Somatostatin; D000324:Adrenocorticotropic Hormone; D008550:Melatonin