HPCAL1/S100A4 protein level ratio in blood (OBA_2053072) can be described as follows. A compound attribute that is the ratio of amount of hippocalcin-like protein 1 (human) in blood to amount of protein S100-A4 (human) in blood. Also known as: the ratio of amount of hippocalcin-like protein 1 (human) in blood to amount of protein S100-A4 (human) in blood.