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. 2012 Jun 4;7(6):e38393. doi: 10.1371/journal.pone.0038393

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Backcattered SEM was employed to explore the cervical root surface (white boxes) in (A) Alpl ^+/+ control and (B) Alpl ^−/− first molars. At higher magnification, the acellular cementum layer (white arrows) in the (C) control molar can be distinguished by contrast differences due to slightly lower mineralization than underlying dentin (d). (D) No acellular cementum layer was apparent in the cervical region of the Alpl ^−/− molar. Abbreviations: d = dentin; c = acellular cementum; p = periodontal ligament.