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).
Exposure to visible light in a manner, such as for a length of time or at a level, which would not be considered natural, usual or environmental and which is designed to elicit or evoke an action or response in a cell, an excitable tissue, or an organism.