MANF/MPIG6B protein level ratio in blood (OBA_2053814, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood. Also known as: the ratio of amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood to amount of megakaryocyte and platelet inhibitory receptor G6b (human) in blood.