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 anatomical surface separating somites; somite formation requires the physical separation of somitic tissue from the initially continuous presomitic mesoderm (PSM), coalescence of cells in the forming somite, and the establishment of a stable border between the somite and the PSM; when a somite forms in the anterior end of the PSM, an intersomitic boundary (also called a fissure, gap, or cleft) emerges, and it is rapidly followed by a mesenchymal-to-epithelial transition of cells that face a forming gap