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).
An organic, polyatomic cation, formed as an ester of acetic acid and choline, that acts as a neurotransmitter in both the peripheral nervous system (PNS) and central nervous system (CNS) in many organisms.