ATG4A/NSFL1C protein level ratio in blood (OBA_2054107, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of cysteine protease ATG4A (human) in blood to amount of NSFL1 cofactor p47 (human) in blood. Also known as: the ratio of amount of cysteine protease ATG4A (human) in blood to amount of NSFL1 cofactor p47 (human) in blood.