CD74/NPDC1 protein level ratio in blood (OBA_2053366) can be described as follows. A compound attribute that is the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of neural proliferation differentiation and control protein 1 (human) in blood. Also known as: the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of neural proliferation differentiation and control protein 1 (human) in blood.