上皮根鞘细胞染色阳性。
组织病理学检查示肿瘤呈分叶状增生，与表皮相连，主要由向外毛根鞘分化的鳞状上皮组成，周边基底细胞排列成栅栏状。
They were mainly consisted of epithelia differentiated towards cells of the outer root sheath, and the peripheral basal cells of the tumor lobules showed palisading arrangement.
釉质基质蛋白由Hert wigs上皮根鞘分泌，能诱导发育牙根上的非细胞牙骨质的初期成形。
Enamel matrix protein is secreted by Hertwig's epithelial root sheath and is responsible for initiating the original formation of acellular cementum on the developing tooth root.
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