A compound attribute that is the ratio of amount of cathepsin F (human) in blood to amount of cathepsin L2 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054620 (CTSF/CTSV protein level ratio in blood). Also known as: the ratio of amount of cathepsin F (human) in blood to amount of cathepsin L2 (human) in blood.