The amount of a Rap guanine nucleotide exchange factor 5 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes entry OBA_2080159 (level of Rap guanine nucleotide exchange factor 5 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid Rap guanine nucleotide exchange factor 5 (human) amount.