Distribution of serotonin in the nervous system of various animal species.
D000818:Animals; D000845:Annelida; D001181:Arthropods; D005075:Biological Evolution; D001717:Birds; D003063:Cnidaria; D004447:Echinodermata; D056890:Eukaryota; D005399:Fishes; D006376:Helminths; D008322:Mammals; D008974:Mollusca; D009420:Nervous System / Q000032:analysis*; D012104:Reptiles; D012701:Serotonin / Q000032:analysis*
D012701:Serotonin