A compound attribute that is the ratio of amount of repulsive guidance molecule A (human) in blood to amount of repulsive guidance molecule B (human) in blood. The trait is RGMA/RGMB protein level ratio in blood (Ontology of Biological Attributes term OBA_2053136). Also known as: the ratio of amount of repulsive guidance molecule A (human) in blood to amount of repulsive guidance molecule B (human) in blood.