Ontology of Biological Attributes term OBA_2055920 (level of signal-regulatory protein beta-1 isoforms 1/2 (human) in cerebrospinal fluid) is the amount of a signal-regulatory protein beta-1 isoforms 1/2 (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid signal-regulatory protein beta-1 isoforms 1/2 (human) amount.