GAS6/NOTCH1 protein level ratio in blood (OBA_2053693, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of growth arrest-specific protein 6 (human) in blood to amount of neurogenic locus notch homolog protein 1 (human) in blood. Also known as: the ratio of amount of growth arrest-specific protein 6 (human) in blood to amount of neurogenic locus notch homolog protein 1 (human) in blood.