A commentary on comparative phamacology.
D000109:Acetylcholine / Q000032:analysis; D000818:Animals; D001001:Anura; D001681:Biological Assay; D005971:Glutamates / Q000494:pharmacology; D007865:Leeches; D008722:Methods; D008974:Mollusca / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology; D010455:Peptides / Q000494:pharmacology; D010600:Pharmacology; D012701:Serotonin / Q000494:pharmacology; D012879:Skin Physiological Phenomena; D013045:Species Specificity; D005680:gamma-Aminobutyric Acid / Q000494:pharmacology
D005971:Glutamates; D010455:Peptides; D012701:Serotonin; D005680:gamma-Aminobutyric Acid; D000109:Acetylcholine