The amount of a S-adenosylmethionine synthase isoform type-1 (human) when measured in cerebrospinal fluid. The trait is level of S-adenosylmethionine synthase isoform type-1 (human) in cerebrospinal fluid (OBA_2058423). Also known as: cerebrospinal fluid S-adenosylmethionine synthase isoform type-1 (human) amount.