title: Free and choline assay.
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000032:analysis; D001923:Brain Chemistry; D002794:Choline / Q000032:analysis* / Q000097:blood / Q000378:metabolism; D006801:Humans; D008722:Methods; D010767:Phosphorylcholine / Q000032:analysis
chemical_list: D010767:Phosphorylcholine; D002794:Choline