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 drink made up of water and a specified amount of sodium, i.e. sodium ions, consumed by an organism as part of an experiment. A sodium ion is an atom of sodium, the chemical element with atomic number 11, that has lost one electron, forming a cation with a charge of +1.