The amount of a serine/threonine-protein phosphatase 4 regulatory subunit 3A (human) when measured in cerebrospinal fluid. The trait is level of serine/threonine-protein phosphatase 4 regulatory subunit 3A (human) in cerebrospinal fluid (OBA_2059296). Also known as: cerebrospinal fluid serine/threonine-protein phosphatase 4 regulatory subunit 3A (human) amount.