Figure 1: Photomicrographs of the male albino rats lung of the control group showing in (A), the alveoli (a) and interalveolar septum (arrow) H&E X400. In (B), the alveolar sac (s) and the alveoli (a) Masson trichrome X400. In (C), the alveolar duct (d) H&E X100. In (D), immunostaining for bcl-2 (arrows) X400. In (E), positive immunostaining for bax (arrow) X400. In (F), positive immunostaining for ki67 (arrow) X400.