level of guanine nucleotide exchange factor for Rab-3A (human) in cerebrospinal fluid (Ontology of Biological Attributes identifier OBA_2059980) is the amount of a guanine nucleotide exchange factor for Rab-3A (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid guanine nucleotide exchange factor for Rab-3A (human) amount.