Ontology of Biological Attributes entry OBA_2054627 (CTSZ/NAAA 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 N-acylethanolamine-hydrolyzing acid amidase (human) in blood. Also known as: the ratio of amount of cathepsin Z (human) in blood to amount of N-acylethanolamine-hydrolyzing acid amidase (human) in blood.