A compound attribute that is the ratio of amount of HLA class I histocompatibility antigen, alpha chain E (human) in blood to amount of interleukin-15 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2053030 (HLAE/IL15 protein level ratio in blood). Also known as: the ratio of amount of HLA class I histocompatibility antigen, alpha chain E (human) in blood to amount of interleukin-15 (human) in blood.