A compound attribute that is the ratio of amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood. The trait is PILRA/TNFRSF1A protein level ratio in blood (OBA_2054017). Also known as: the ratio of amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood.