Ontology of Biological Attributes id OBA_2053455 (GSTA3/KRT18 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of glutathione S-transferase A3 (human) in blood to amount of keratin, type I cytoskeletal 18 (human) in blood. Also known as: the ratio of amount of glutathione S-transferase A3 (human) in blood to amount of keratin, type I cytoskeletal 18 (human) in blood.