title: Do behaviorally active polypeptide hormones act at crucial "command" sites or at many sites, from "command" down to "final common paths"?
mesh_terms: D000818:Animals; D001519:Behavior; D001681:Biological Assay; D005724:Ganglia / Q000502:physiology; D006728:Hormones / Q000502:physiology*; D007448:Invertebrates; D010455:Peptides / Q000502:physiology*
chemical_list: D006728:Hormones; D010455:Peptides