A compound attribute that is the ratio of amount of granzyme A (human) in blood to amount of tumor necrosis factor receptor superfamily member 4 (human) in blood. The trait is GZMA/TNFRSF4 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2053121). Also known as: the ratio of amount of granzyme A (human) in blood to amount of tumor necrosis factor receptor superfamily member 4 (human) in blood.