ART3/RGMA protein level ratio in blood (OBA_2054101, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of ecto-ADP-ribosyltransferase 3 (human) in blood to amount of repulsive guidance molecule A (human) in blood. Also known as: the ratio of amount of ecto-ADP-ribosyltransferase 3 (human) in blood to amount of repulsive guidance molecule A (human) in blood.