Ontology of Biological Attributes identifier OBA_2055778 (ACVRL1/TNFRSF10B protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of activin receptor type-1-like (human) in blood to amount of tumor necrosis factor receptor superfamily member 10B (human) in blood. Also known as: the ratio of amount of activin receptor type-1-like (human) in blood to amount of tumor necrosis factor receptor superfamily member 10B (human) in blood.