Ontology of Biological Attributes entry OBA_2053336 (CD63/GLB1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of CD63 antigen (human) in blood to amount of beta-galactosidase (human) in blood. Also known as: the ratio of amount of CD63 antigen (human) in blood to amount of beta-galactosidase (human) in blood.