TBC1D23/TBC1D5 protein level ratio in blood (OBA_2053107, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of TBC1 domain family member 23 (human) in blood to amount of TBC1 domain family member 5 (human) in blood. Also known as: the ratio of amount of TBC1 domain family member 23 (human) in blood to amount of TBC1 domain family member 5 (human) in blood.