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Absence of β-catenin in odontoblasts has little impact on their apoptosis. Apoptosis was analyzed by active caspase-3 staining (A and B) and TUNEL assay (C and D). The inset in B shows positive signals in the ameloblast layer as a positive control. Yellow arrows in C and D indicate scarce signals from differentiated odontoblasts. D, dentin; DP, dental pulp; OD(r), root odontoblast. Scale bar: 100μm.
