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).
Measurement of the amount in blood of an amine compound containing one amino group and derived from an aromatic amino acid, that is produced in one part or organ of the body and initiates or regulates the activity of an organ or a group of cells in another part of the body.