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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 (

Term:placenta weight at gestational day 20
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Accession:CMO:0002090 term browser browse the term
Definition:The heaviness of the placenta, i.e., the degree to which it is drawn to the earth by gravity, measured on the 21st day after insemination.

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  clinical measurement 2369
    body morphological measurement 763
      organ morphological measurement 286
        female reproductive organ morphological measurement 1
          placenta morphological measurement 1
            placenta weight 1
              placenta weight at gestational day 20 0
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