A compound attribute that is the ratio of amount of monoglyceride lipase (human) in blood to amount of serine/threonine-protein kinase 4 (human) in blood. The trait is MGLL/STK4 protein level ratio in blood (OBA_2054452, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of monoglyceride lipase (human) in blood to amount of serine/threonine-protein kinase 4 (human) in blood.