A compound attribute that is the ratio of amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood to amount of sushi domain-containing protein 1 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054547 (MPIG6B/SUSD1 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 sushi domain-containing protein 1 (human) in blood.