A compound attribute that is the ratio of amount of interleukin-19 (human) in blood to amount of serine protease 27 (human) in blood. The trait is IL19/PRSS27 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054427). Also known as: the ratio of amount of interleukin-19 (human) in blood to amount of serine protease 27 (human) in blood.