FADD/FXN protein level ratio in blood (OBA_2055438, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of FAS-associated death domain protein (human) in blood to amount of frataxin, mitochondrial (human) in blood. Also known as: the ratio of amount of FAS-associated death domain protein (human) in blood to amount of frataxin, mitochondrial (human) in blood.