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 long, polymeric chain of alternating phosphate and deoxyribose units with the bases adenine, guanine, cytosine, and thymine bonded to the deoxyribose. DNA can be single stranded or double stranded, that is, composed of either a single polymer or a pair of antiparallel polymers joined by hydrogen bonding between complementary bases.