5-HIAA in cerebrospinal fluid.
D004314:Down Syndrome / Q000097:blood / Q000134:cerebrospinal fluid; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000134:cerebrospinal fluid*; D012701:Serotonin / Q000097:blood*
D012701:Serotonin; D006897:Hydroxyindoleacetic Acid