The amount of a methenyltetrahydrofolate synthase domain-containing protein (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes identifier OBA_2059056 (level of methenyltetrahydrofolate synthase domain-containing protein (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid methenyltetrahydrofolate synthase domain-containing protein (human) amount.