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 in a specified sample of serum of the G2a subclass of immunoglobulin G (IgG), the most abundant class of antibodies found in blood serum and lymph. IgG antibodies are active against bacteria, fungi, viruses, and foreign particles, and trigger action of the complement system. IgG subclasses differ in the structure of their hinge regions. IgG2a is able to activate complement and bind to the Fc receptor on phagocytic cells.