Ontology of Biological Attributes entry OBA_2058900 (level of receptor tyrosine-protein kinase erbB-4 (human) in cerebrospinal fluid) is the amount of a receptor tyrosine-protein kinase erbB-4 (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid receptor tyrosine-protein kinase erbB-4 (human) amount.