level of phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform (human) in cerebrospinal fluid (OBA_2081926) is the amount of a phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform (human) amount.