Ontology of Biological Attributes term OBA_2053229 (REG1A/REG4 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of lithostathine-1-alpha (human) in blood to amount of regenerating islet-derived protein 4 (human) in blood. Also known as: the ratio of amount of lithostathine-1-alpha (human) in blood to amount of regenerating islet-derived protein 4 (human) in blood.