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 drug or other chemical that can combine with a receptor to produce a physiologic reaction typical of a naturally occurring substance. A receptor is a molecule on the surface or within a cell that recognizes and binds with specific molecules, producing a specific effect in the cell.