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).
A measurement of the two-dimensional extent of the enclosed cavity or channel in a cross-section of an artery, one of the large blood vessels carrying blood in a direction away from the heart to the tissues. For an artery with a neointimal lesion, the cross-sectional area of the lesion would be subtracted from the circular vessel area to obtain the artery lumen area.