A compound attribute that is the ratio of amount of mitochondrial fission 1 protein (human) in blood to amount of serine protease HTRA2, mitochondrial (human) in blood. The trait is FIS1/HTRA2 protein level ratio in blood (OBA_2055402, an Ontology of Biological Attributes term). Also known as: the ratio of amount of mitochondrial fission 1 protein (human) in blood to amount of serine protease HTRA2, mitochondrial (human) in blood.