The amount of a protein kinase C and casein kinase substrate in neurons protein 3 (human) when measured in cerebrospinal fluid. The trait is level of protein kinase C and casein kinase substrate in neurons protein 3 (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2081600). Also known as: cerebrospinal fluid protein kinase C and casein kinase substrate in neurons protein 3 (human) amount.