PLPBP/SERPINB1 protein level ratio in blood (OBA_2053517) can be described as follows. A compound attribute that is the ratio of amount of pyridoxal phosphate homeostasis protein (human) in blood to amount of leukocyte elastase inhibitor (human) in blood. Also known as: the ratio of amount of pyridoxal phosphate homeostasis protein (human) in blood to amount of leukocyte elastase inhibitor (human) in blood.