Assertion: cementum's fiber | /r/CapableOf | insert through acellular cementum
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Source sentences:
text: PR staining showed that the PDL collagen fibers clearly extended from the alveolar bone to the tooth root surface in a highly organized fashion, and made visible the Sharpey’s fibers inserting through the acellular cementum give that tissue its namesake ‘extrinsic fibers’ (Figure 3d).