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 additional extensions of the villi of the small intestine which protrude from the apical surface of the epithelial cells lining the villi; the microvilli increase the absorptive surface area of the small intestine by approximately 600-fold