AXL/CD163 protein level ratio in blood (OBA_2053536, an Ontology of Biological Attributes entry) 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 scavenger receptor cysteine-rich type 1 protein M130 (human) in blood. Also known as: the ratio of amount of tyrosine-protein kinase receptor UFO (human) in blood to amount of scavenger receptor cysteine-rich type 1 protein M130 (human) in blood.