A compound attribute that is the ratio of amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2054542 (MPIG6B/PDGFB protein level ratio in blood). Also known as: the ratio of amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.