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.
presence of one or more benign masses derived from the epidermis or the epithelium of a hair follicle, formed by enclosure of epithelium within the dermis and filled with keratin and lipid-rich inclusions