Assertion: acellular extrinsic fiber cementum | /r/HasProperty | . 2.18
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text: Smaller incisors, like those of rodents and lagomorphs, tend to have a simple layer of acellular extrinsic-fiber cementum (Fig. 2.18), whereas the massive tusks of the walrus, narwhal, and elephant are covered with cellular mixed-fiber cementum, which is often very thick and multilayered (Fig. 2.19).