The amount of a cyanocobalamin reductase / alkylcobalamin dealkylase (human) when measured in cerebrospinal fluid. The trait is OBA_2081814 (level of cyanocobalamin reductase / alkylcobalamin dealkylase (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid cyanocobalamin reductase / alkylcobalamin dealkylase (human) amount.