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Mammalian tooth development depends on activation of odontogenic potential in the presumptive dental mesenchyme by the Msx1 and Pax9 transcription factors. We recently reported that the zinc finger transcription factor Osr2 was expressed in a lingual-to-buccal gradient pattern surrounding the developing mouse molar tooth germs and mice lacking Osr2 developed supernumerary teeth lingual to their molars...
Classical tissue recombination studies demonstrated that initiation of tooth development depends on activation of odontogenic potential in the mesenchyme by signals from the presumptive dental epithelium. Although several members of the Wnt family of signaling molecules are expressed in the presumptive dental epithelium at the beginning of tooth initiation, whether Wnt signaling is directly involved...
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