Ontology of Biological Attributes term OBA_2055385 (CD27/DLL1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of delta-like protein 1 (human) in blood. Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of delta-like protein 1 (human) in blood.