Ontology of Biological Attributes id OBA_2054307 (ALPP/MSLN protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of alkaline phosphatase, placental type (human) in blood to amount of mesothelin (human) in blood. Also known as: the ratio of amount of alkaline phosphatase, placental type (human) in blood to amount of mesothelin (human) in blood.