The amount of a bifunctional methylenetetrahydrofolate dehydrogenase/cyclohydrolase, mitochondrial (human) when measured in cerebrospinal fluid. The trait is OBA_2057137 (level of bifunctional methylenetetrahydrofolate dehydrogenase/cyclohydrolase, mitochondrial (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid bifunctional methylenetetrahydrofolate dehydrogenase/cyclohydrolase, mitochondrial (human) amount.