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.
a bony defect or stress fracture within the pars interarticularis of the vertebral arch in the spinal column; pars interarticularis is the part of a vertebra located between the inferior and superior articular processes of the facet joint