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).
The amount of cholesterol, a eukaryotic sterol that in higher animals is the precursor of bile acids and steroid hormones and a key constituent of cell membrane, found in a specified sample of liver tissue, a collection of similar cells in a matrix acting together to perform a particular function isolated from the liver, the large, dark-red organ located in the cranial portion of the abdomen of vertebrates, just behind or below the diaphragm, the functions of which include storage and filtration of blood; secretion of bile; detoxification of noxious substances; conversion of sugars into glycogen; synthesis and breakdown of fats and temporary storage of fatty acids; and synthesis of serum proteins.