FAP/MEGF10 protein level ratio in blood (OBA_2055357, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of prolyl endopeptidase FAP (human) in blood to amount of multiple epidermal growth factor-like domains protein 10 (human) in blood. Also known as: the ratio of amount of prolyl endopeptidase FAP (human) in blood to amount of multiple epidermal growth factor-like domains protein 10 (human) in blood.