Unique vascular relationship in the human umbilical cord.
D006801:Humans; D009130:Muscle, Smooth / Q000502:physiology; D010477:Perfusion; D012701:Serotonin / Q000494:pharmacology*; D014469:Umbilical Arteries / Q000187:drug effects* / Q000502:physiology; D014471:Umbilical Veins / Q000187:drug effects* / Q000502:physiology
D012701:Serotonin