Ontology of Biological Attributes entry OBA_2057036 (level of T-cell-specific surface glycoprotein CD28 (human) in cerebrospinal fluid) is the amount of a T-cell-specific surface glycoprotein CD28 (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid T-cell-specific surface glycoprotein CD28 (human) amount.