Ontology of Biological Attributes id OBA_2054341 (ICAM3/LY9 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of intercellular adhesion molecule 3 (human) in blood to amount of T-lymphocyte surface antigen Ly-9 (human) in blood. Also known as: the ratio of amount of intercellular adhesion molecule 3 (human) in blood to amount of T-lymphocyte surface antigen Ly-9 (human) in blood.