Ontology of Biological Attributes entry OBA_2053926 (APRT/NSFL1C protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of adenine phosphoribosyltransferase (human) in blood to amount of NSFL1 cofactor p47 (human) in blood. Also known as: the ratio of amount of adenine phosphoribosyltransferase (human) in blood to amount of NSFL1 cofactor p47 (human) in blood.