A compound attribute that is the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of T-cell immunoglobulin and mucin domain-containing protein 4 (human) in blood. The trait is OBA_2053367 (CD74/TIMD4 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 T-cell immunoglobulin and mucin domain-containing protein 4 (human) in blood.