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Examples of hematoxylin and eosin (H&E) staining of (A) normal endometrium, (B) endometrial hyperplasia without atypia, (C) atypical hyperplasia and pyruvate kinase M2 (PKM2) immunostaining of (D) normal endometrium, (E) endometrial hyperplasia without atypia, (F) atypical hyperplasia.
