A compound attribute that is the ratio of amount of CD40 ligand (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood. The trait is CD40LG/MPIG6B protein level ratio in blood (OBA_2054214, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of CD40 ligand (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood.