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.
a protruding sac formed by the dilation of the wall of the part of the descending aorta that begins at the diaphragm and continues to the point of the common iliac arteries, resulting from a weakening of the vessel wall