A compound attribute that is the ratio of amount of pre-pro-epidermal growth factor (human) in blood to amount of peptidyl-prolyl cis-trans isomerase B (human) in blood. The trait is EGF/PPIB protein level ratio in blood (OBA_2055606, an Ontology of Biological Attributes term). Also known as: the ratio of amount of pre-pro-epidermal growth factor (human) in blood to amount of peptidyl-prolyl cis-trans isomerase B (human) in blood.