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The schema of morphology and expression dynamics from the undifferentiated DF to the developing periodontium. The DF was shaped like a crescent and was located between the root apex and the alveolar bone during root development. The molecules of WNT5a, β-Catenin and COL-I were expressed strongly in the developing periodontium, which was located at the lateral coronal corner of the DF. Conversely, these genes were expressed at low levels in the region of DF beneath the AF.
