KLK6/PTPRN2 protein level ratio in blood (OBA_2055510, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of kallikrein-6 (human) in blood to amount of receptor-type tyrosine-protein phosphatase N2 (human) in blood. Also known as: the ratio of amount of kallikrein-6 (human) in blood to amount of receptor-type tyrosine-protein phosphatase N2 (human) in blood.