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 creatine in a specified sample of urine, the fluid waste product excreted by the kidneys. Creatine is a nitrogenous organic acid (a non-protein amino acid) occurring in vertebrate tissues, particularly in muscle, where the phosphorylated form serves as an important storage form of high-energy phosphate and supplies energy for muscle contraction.