Ontology of Biological Attributes entry OBA_2056953 (level of U2 small nuclear ribonucleoprotein A' (human) in cerebrospinal fluid) is the amount of a U2 small nuclear ribonucleoprotein A' (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid U2 small nuclear ribonucleoprotein A' (human) amount.