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Pathological examination of lung and brain tissues. (a and d) Lung (a) and brain (d) tissues from group 1 pig no. 5; (b and e) lung (b) and brain (e) tissues from group 2 pig no. 20; (c and f) lung (c) and brain (f) tissues from a control pig. The tissues were stained with hematoxylin and eosin (magnification, ×200).
