Mitochondrial catalase suppresses naturally occurring lung cancer in old mice.

increased mitotic activity; 3=Moderately increased number of abnormal appearing cellular features with significantly increased distortion of cellular boundaries and mitotic activity, and evidence of capsular penetration; 4=Severe increase in the number of abnormal appearing cellular features with a highly significant increase in distortion of cellular boundaries and mitotic activity, and frank capsular penetration and invasion of surrounding tissue.

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