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.
persistence of an early embryonic state in which the urinary, genital, and gastrointestinal tracts remain confluent and communicate with the exterior through a single perineal opening; due to failure of the urogenital septum to divide the embryonic cloaca into rectal and urogenital portions
Comment:
Note that the term "urogenital sinus" may refer to the primitive urogenital sinus present as a transient developmental structure in most mammals or it may refer to a condition in which an unseptated cloaca persists in animals longer than normal.