A compound attribute that is the ratio of amount of interleukin-15 (human) in blood to amount of natural cytotoxicity triggering receptor 1 (human) in blood. The trait is OBA_2054420 (IL15/NCR1 protein level ratio in blood). Also known as: the ratio of amount of interleukin-15 (human) in blood to amount of natural cytotoxicity triggering receptor 1 (human) in blood.