Ontology of Biological Attributes entry OBA_2056320 (level of low-density lipoprotein receptor-related protein 4 (human) in cerebrospinal fluid) is the amount of a low-density lipoprotein receptor-related protein 4 (human) when measured in cerebrospinal fluid. Also known as: cerebrospinal fluid low-density lipoprotein receptor-related protein 4 (human) amount.