A compound attribute that is the ratio of amount of angiogenin (human) in blood to amount of C-C motif chemokine 18 (human) in blood. The trait is ANG/CCL18 protein level ratio in blood (OBA_2054265, an Ontology of Biological Attributes identifier). Also known as: the ratio of amount of angiogenin (human) in blood to amount of C-C motif chemokine 18 (human) in blood.