The amount of a transcription factor IIIB 90 kDa subunit (human) when measured in cerebrospinal fluid. The trait is level of transcription factor IIIB 90 kDa subunit (human) in cerebrospinal fluid (Ontology of Biological Attributes term OBA_2080226). Also known as: cerebrospinal fluid transcription factor IIIB 90 kDa subunit (human) amount.