A compound attribute that is the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of junctional adhesion molecule B (human) in blood. The trait is OBA_2053364 (CD74/JAM2 protein level ratio in blood). Also known as: the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of junctional adhesion molecule B (human) in blood.