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).
One of the two types of reproductive cycles. Specifically, the correlated phenomena of the endocrine and reproductive systems of a female (especially, non-primate) mammal resulting in regularly occurring periods during which the female is sexually active and receptive, estrus, separated by periods in which there is no sexual receptivity.