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Typical histological subtypes of X‐ray‐induced rat lung tumors with and without the Egfr mutations. (a) Papillary type adenocarcinoma. (b) Solid type adenocaricnoma. (c) Acinar type adenocarcinoma. The tumors of (a) and (b) exhibit the Egfr mutations and (c) is without the Egfr mutation. Histological classifications refer to our previous study.( 15 , 20 ) Scale bars, 500 µm.
