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).
The combined weight of both ventricles of the heart, that is, their heaviness or the degree to which they are drawn toward the earth by gravity. The ventricles are the lower chambers of the heart that pump blood away from the heart either to the lungs to be oxygenated or, once oxygenated, to the rest of the body.