Fig. 3.

Histologically-scored findings in the lungs of the rats exposed to stable Mn, ⁵⁶Mn, 2.0 Gy γ-radiation and no irradiation. (A) hemorrhage; (B) emphysema; (C) inflammation; (D) elastin; and (E) collagen findings in four groups: externally exposed, ⁵⁶Mn (2×) internally exposed, ⁵⁶Mn (4×) internally exposed and unexposed control and findings in 2.0 Gy γ-radiation externally exposed, stable Mn, ⁵⁶Mn (1×) internally exposed and unexposed control groups. Bars, mean  ±  standard error of the mean (SEM) (n = 3–6). ^*P < 0.05, ^**P < 0.01 vs control. ^#P < 0.05, ^##P < 0.01 vs ⁵⁶Mn (2×) [6].