A compound attribute that is the ratio of amount of Crk-like protein (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood. The trait is CRKL/EGF protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054497). Also known as: the ratio of amount of Crk-like protein (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood.