EDAR/EGF protein level ratio in blood (OBA_2055617, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member EDAR (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood. Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member EDAR (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood.