PDGFB/ST6GAL1 protein level ratio in blood (OBA_2053986, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of beta-galactoside alpha-2,6-sialyltransferase 1 (human) in blood. Also known as: the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of beta-galactoside alpha-2,6-sialyltransferase 1 (human) in blood.