Ontology of Biological Attributes id OBA_2054625 (CTSZ/HSPG2 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of cathepsin Z (human) in blood to amount of basement membrane-specific heparan sulfate proteoglycan core protein (human) in blood. Also known as: the ratio of amount of cathepsin Z (human) in blood to amount of basement membrane-specific heparan sulfate proteoglycan core protein (human) in blood.