anatomical entity attribute CD74/TNFRSF21 protein level ratio in blood true PMID:38412862 https://orcid.org/0000-0001-6757-4744 the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of tumor necrosis factor receptor superfamily member 21 (human) in blood A compound attribute that is the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of tumor necrosis factor receptor superfamily member 21 (human) in blood. protein measurement