A compound attribute that is the ratio of amount of cytotoxic and regulatory T-cell molecule (human) in blood to amount of intercellular adhesion molecule 3 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054508 (CRTAM/ICAM3 protein level ratio in blood). Also known as: the ratio of amount of cytotoxic and regulatory T-cell molecule (human) in blood to amount of intercellular adhesion molecule 3 (human) in blood.