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These ontologies provide the framework for presenting what was measured, how it was measured, and under what conditions it was measured.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>There has been a continuing expansion of subdomains in each ontology with a parallel 2\u20133 fold increase in the total number of terms, substantially increasing the size and improving the scope of the ontologies. The proportion of terms with textual definitions has increased from ~60% to over 80% with greater synchronization of format and content throughout the three ontologies. Representation of definition source Uniform Resource Identifiers (URI) has been standardized, including the removal of all non-URI characters, and systematic versioning of all ontology files has been implemented. The continued expansion and success of these ontologies has facilitated the integration of more than 60,000 records into the RGD PhenoMiner database. In addition, new applications of these ontologies, such as annotation of Quantitative Trait Loci (QTL), have been added at the sites actively using them, including RGD and the Animal QTL Database.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>The improvements to these three ontologies have been substantial, and development is ongoing. New terms and expansions to the ontologies continue to be added as a result of active curation efforts at RGD and the Animal QTL database. Use of these vocabularies to standardize data representation for quantitative phenotypes and quantitative trait loci across databases for multiple species has demonstrated their utility for integrating diverse data types from multiple sources. These ontologies are freely available for download and use from the NCBO BioPortal website at <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/bioportal.bioontology.org\/ontologies\/1583\" ext-link-type=\"uri\">http:\/\/bioportal.bioontology.org\/ontologies\/1583<\/jats:ext-link> (CMO), <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/bioportal.bioontology.org\/ontologies\/1584\" ext-link-type=\"uri\">http:\/\/bioportal.bioontology.org\/ontologies\/1584<\/jats:ext-link> (MMO), and <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/bioportal.bioontology.org\/ontologies\/1585\" ext-link-type=\"uri\">http:\/\/bioportal.bioontology.org\/ontologies\/1585<\/jats:ext-link> (XCO), or from the RGD ftp site at <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"ftp:\/\/rgd.mcw.edu\/pub\/ontology\/\" ext-link-type=\"uri\">ftp:\/\/rgd.mcw.edu\/pub\/ontology\/<\/jats:ext-link>.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/2041-1480-4-26","type":"journal-article","created":{"date-parts":[[2013,10,8]],"date-time":"2013-10-08T18:26:18Z","timestamp":1381256778000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["The clinical measurement, measurement method and experimental condition ontologies: expansion, improvements and new applications"],"prefix":"10.1186","volume":"4","author":[{"given":"Jennifer R","family":"Smith","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carissa A","family":"Park","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rajni","family":"Nigam","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stanley JF","family":"Laulederkind","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G Thomas","family":"Hayman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shur-Jen","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy F","family":"Lowry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victoria","family":"Petri","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeff De","family":"Pons","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marek","family":"Tutaj","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weisong","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth A","family":"Worthey","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mary","family":"Shimoyama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Melinda R","family":"Dwinell","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,10,8]]},"reference":[{"key":"217_CR1","unstructured":"Rat genome database. 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