Ontology of Biological Attributes term OBA_2053150 (ROBO1/SPON1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of roundabout homolog 1 (human) in blood to amount of spondin-1 (human) in blood. Also known as: the ratio of amount of roundabout homolog 1 (human) in blood to amount of spondin-1 (human) in blood.