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Scanning electron micrograph of normal mouse lung. (A) Normal young adult (2 mo) C57/Bl6 mouse. (B) Normal old (24 mo) C57/Bl6 mouse. Alveolar pores can be readily observed in both preparations. They are increased in size and number in the old mouse lung. An increase in alveolar size and effacement of the alveolar walls can also be appreciated.
