A compound attribute that is the ratio of amount of proteinase-activated receptor 1 (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood. The trait is OBA_2055329 (F2R/MPIG6B protein level ratio in blood). Also known as: the ratio of amount of proteinase-activated receptor 1 (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood.