The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories (ftp://ftp.informatics.jax.org/pub/reports/index.html). For more information about these ontologies, see the MGI Publications Page at http://www.informatics.jax.org/mgihome/other/publications.shtml.
any structural anomaly of a transient cluster of cells in the central part of the dental epithelium facing the dental mesenchyme, which acts as an organizing center, providing positional information for tooth morphogenesis and regulating the growth of tooth cusps