A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of TGF-beta receptor type-2 (human) in blood. The trait is CD27/TGFBR2 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2055289). Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of TGF-beta receptor type-2 (human) in blood.