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 rostral-most segment of the vertebral column that is formed by the fusion of three to five coccygeal vertebrae in adult humans and tailless primates
Comment:
In humans and other tailless primates (e.g. great apes), the coccyx is the remnant of a vestigial tail. It consists of 3-5 separate or fused vertebrae (the coccygeal vertebrae) below the sacrum.