CD27/NBL1 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2055388) can be described as follows. A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood. Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood.