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.
absence of the primordial embryonic connective tissue of the developing head, normally consisting of mesenchymal cells supported in interlaminar jelly, that derive mostly from the mesoderm and contribute to head connective tissue, bone and musculature in conjunction with cranial neural crest cells