CD74/LILRB4 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2053365) 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 leukocyte immunoglobulin-like receptor subfamily B member 4 (human) in blood. Also known as: the ratio of amount of HLA class II histocompatibility antigen gamma chain (human) in blood to amount of leukocyte immunoglobulin-like receptor subfamily B member 4 (human) in blood.