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Photomicrographs of lung slides of 7 (A) and 21 (B) days old pups. TUNEL findings of the groups; (a) control group, a TUNEL positive cell (arrow), (b) TS group, numerous TUNEL positive cells (arrows), (c) TS + ALA group, numerous TUNEL positive cells (arrows), (d) ALA group, a few TUNEL positive cells (arrows). (x40).
