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Basal cells express NGFR/p75 in a single layer of cells sitting atop the basement membrane. In contrast, nonbasal cells express CK13. A rare cell expresses both NGFR and CK13 (arrow) and may represent a differentiating transitional cell. Scale bars 5 μm. CK = cytokeratin; NGFR = nerve growth factor receptor. [Color figure can be viewed in the online issue, which is available at www.laryngoscope.com.]
