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).
An experimental procedure performed in or on a living body, for example, a procedure performed on an organ in situ or on the entire living organism, which employs a strip of wood, metal, or other material, having straight edges and graduated, for example in millimetres or inches, used for measuring lengths.