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Apoptosis of alveolar septum cells in C57BL/6 J mice induced by CS exposure and that induced by intraperitoneal injection of CSE (×400). The number of apoptotic alveolar septum cells in C57BL/6 J mice induced by cigarette smoke exposure (C1) was increased when compared with the controls (N1). The number of apoptotic alveolar septum cells in C57BL/6 J mice induced by intraperitoneal injection of cigarette smoke extract (C2) was also increased when compared with the controls (N2).
