A compound attribute that is the ratio of amount of paired immunoglobulin-like type 2 receptor beta (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054019 (PILRB/TNFRSF1A protein level ratio in blood). Also known as: the ratio of amount of paired immunoglobulin-like type 2 receptor beta (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood.