The Clinical Measurement Ontology (CMO), Measurement Methods Ontology (MMO), and Experimental Condition Ontology (XCO) are currently being developed at the Rat Genome Database. For more information about these vocabularies please see Shimoyama et al. Three ontologies to define phenotype measurement data. Front Genet. 2012;3:87. Epub 2012 May 28 or contact us (http://rgd.mcw.edu/contact/index.shtml).
Measurement of the number of lymphocytes expressing the CD8 antigen on their surface in a specified volume of whole blood. CD8 is a glycoprotein on the surface of killer T lymphocytes that enhances binding with major histocompatibility complex molecules.