Figure 3: Photomicrographs of the male albino rats lung of the third group showing in (A), the alveoli (a) and interalveolar septum (arrow) and alveolar sac (s) Masson trichrome X400. In (B), positive immunostaining for bcl-2 (arrows) X400. In (C), weak immunostaining for bax X400. In (D), weak immunostaining for ki67 (arrow) X400.