Ontology of Biological Attributes entry OBA_2054619 (CTSD/PRCP protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of cathepsin D (human) in blood to amount of lysosomal Pro-X carboxypeptidase (human) in blood. Also known as: the ratio of amount of cathepsin D (human) in blood to amount of lysosomal Pro-X carboxypeptidase (human) in blood.