level of Rap guanine nucleotide exchange factor 1 (human) in cerebrospinal fluid (OBA_2058743, an Ontology of Biological Attributes identifier) is the amount of a Rap guanine nucleotide exchange factor 1 (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid Rap guanine nucleotide exchange factor 1 (human) amount.