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A, Barrett's oesophagus with features of indefinite for dysplasia (haematoxylin and eosin staining. B, Barrett's oesophagus with features of indefinite for dysplasia in basal crypts (haematoxylin and eosin staining). C, Same case as in A shows normal (wild‐type) p53 immunochemistry staining pattern. D, same case as in B aberrant (over‐expression) p53 immunochemistry staining pattern in basal crypts.
