The puzzle of peptides--neurotransmitters or gut hormones?
D005768:Gastrointestinal Hormones / Q000502:physiology*; D006801:Humans; D007422:Intestines / Q000502:physiology; D018377:Neurotransmitter Agents / Q000502:physiology*; D010455:Peptides / Q000502:physiology*; D010907:Pituitary Hormones / Q000502:physiology
D005768:Gastrointestinal Hormones; D018377:Neurotransmitter Agents; D010455:Peptides; D010907:Pituitary Hormones