HARS1/MIF protein level ratio in blood (OBA_2053132, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of histidine--tRNA ligase, cytoplasmic (human) in blood to amount of macrophage migration inhibitory factor (human) in blood. Also known as: the ratio of amount of histidine--tRNA ligase, cytoplasmic (human) in blood to amount of macrophage migration inhibitory factor (human) in blood.