A compound attribute that is the ratio of amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood to amount of TGF-beta receptor type-2 (human) in blood. The trait is NBL1/TGFBR2 protein level ratio in blood (OBA_2054653, an Ontology of Biological Attributes id). Also known as: the ratio of amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood to amount of TGF-beta receptor type-2 (human) in blood.