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 the wall between the two lower chambers of the heart; the ventricular septum consists of a very small membranous portion just beneath the aortic valve, and a large thick muscular portion consisting of three sections including the inlet septum, the trabecular septum, and the outlet septum