title: Cyclic 3', 5'-nucleotides in extracellular fluids of neural systems.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D002831:Choroid Plexus / Q000378:metabolism; D000242:Cyclic AMP / Q000097:blood / Q000134:cerebrospinal fluid*; D006152:Cyclic GMP / Q000097:blood / Q000134:cerebrospinal fluid*; D005110:Extracellular Space / Q000378:metabolism*; D005725:Ganglia, Autonomic / Q000378:metabolism*; D006801:Humans; D011618:Psychotic Disorders / Q000378:metabolism; D009435:Synaptic Transmission
chemical_list: D000242:Cyclic AMP; D006152:Cyclic GMP