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Immunohistochemical staining for E-cadherin expression in 18 nasopharyngeal carcinoma tissues. a (×40), keratinizing carcinoma. b (×40), differentiated non-keratinizing carcinoma (type 2). c (×40), undifferentiated non-keratinizing carcinoma (type 3). a–c Moderate staining for E-cadherin protein, d (×40) non-tumoral pharyngeal inflammation; strong staining for E-cadherin protein
