A compound attribute that is the ratio of amount of C-type lectin domain family 4 member D (human) in blood to amount of matrix metalloproteinase-9 (human) in blood. The trait is CLEC4D/MMP9 protein level ratio in blood (OBA_2054989). Also known as: the ratio of amount of C-type lectin domain family 4 member D (human) in blood to amount of matrix metalloproteinase-9 (human) in blood.