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.
atypical formation of or inability to produce the interstitial cells that are found adjacent to the seminiferous tubules in the testicle and produce testosterone in the presence of luteinizing hormone; in most mammals, normal Leydig cell (LC) development comprises two sequential but overlapping cell lineages known as the fetal and adult type LC populations, which display distinct functional characteristics reflected by different morphology, hormonal regulation, and steroidogenic output