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.
arrest, or failure to initiate the extensive and rapid branching of the mammary ducts, expansion of mammary epithelium in the stroma between the ducts with or without abnormalities in nipple maturation in preparation for lactation