Ontology of Biological Attributes id OBA_2058889 (level of serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit alpha isoform (human) in cerebrospinal fluid) is the amount of a serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit alpha isoform (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit alpha isoform (human) amount.