A compound attribute that is the ratio of amount of CD160 antigen (human) in blood to amount of natural cytotoxicity triggering receptor 1 (human) in blood. The trait is CD160/NCR1 protein level ratio in blood (OBA_2055270). Also known as: the ratio of amount of CD160 antigen (human) in blood to amount of natural cytotoxicity triggering receptor 1 (human) in blood.