A compound attribute that is the ratio of amount of CD40 ligand (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood. The trait is CD40LG/EGF protein level ratio in blood (OBA_2054208). Also known as: the ratio of amount of CD40 ligand (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood.