obsolete regionalization involved in semicircular canal formation https://github.com/geneontology/go-ontology/issues/31306 true biological_process dph This term was obsoleted because it is a pre-composed term that should be captured as a GO-CAM model. GO:0060877 2009-08-13T09:56:45Z OBSOLETE. The pattern specification process that results in the subdivision of the otic epithelium in space to define an area or volume in which cells will differentiate to give rise to the semicircular canals.