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.
an invagination or pinching in the visceral endoderm that is centered at the boundary between embryonic and extra-embryonic regions of the developing embryo, often resulting in physical separation of embryonic and extraembryonic ectoderm