CD40LG/FIS1 protein level ratio in blood (Ontology of Biological Attributes id OBA_2054210) can be described as follows. A compound attribute that is the ratio of amount of CD40 ligand (human) in blood to amount of mitochondrial fission 1 protein (human) in blood. Also known as: the ratio of amount of CD40 ligand (human) in blood to amount of mitochondrial fission 1 protein (human) in blood.