The amount of a tryptophan--tRNA ligase, cytoplasmic (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes identifier OBA_2057445 (level of tryptophan--tRNA ligase, cytoplasmic (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid tryptophan--tRNA ligase, cytoplasmic (human) amount.