A compound attribute that is the ratio of amount of myoglobin (human) in blood to amount of nitric oxide synthase 1 (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053788 (MB/NOS1 protein level ratio in blood). Also known as: the ratio of amount of myoglobin (human) in blood to amount of nitric oxide synthase 1 (human) in blood.