A compound attribute that is the ratio of amount of hepatocyte growth factor (human) in blood to amount of matrix metalloproteinase-9 (human) in blood. The trait is OBA_2053025 (HGF/MMP9 protein level ratio in blood). Also known as: the ratio of amount of hepatocyte growth factor (human) in blood to amount of matrix metalloproteinase-9 (human) in blood.