PPME1/PSMD9 protein level ratio in blood (OBA_2053491, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of protein phosphatase methylesterase 1 (human) in blood to amount of 26S proteasome non-ATPase regulatory subunit 9 (human) in blood. Also known as: the ratio of amount of protein phosphatase methylesterase 1 (human) in blood to amount of 26S proteasome non-ATPase regulatory subunit 9 (human) in blood.