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Comparisons of IL-10 (A) and TNF-α (B) expressions in rat lung tissues 24 h after injection with NS or LPS among 4 groups. NS – normal saline; LPS – lipopolysaccharide; C1 – pEGFP-C1; * P<0.05 compared with the NS group; #P<0.05 compared with the LPS group; n=12.