Ontology of Biological Attributes id OBA_2053540 (AXL/MSR1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of tyrosine-protein kinase receptor UFO (human) in blood to amount of macrophage scavenger receptor types I and II (human) in blood. Also known as: the ratio of amount of tyrosine-protein kinase receptor UFO (human) in blood to amount of macrophage scavenger receptor types I and II (human) in blood.