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Effect of Bletilla striata polysaccharide on transepithelial electrical resistance in lipopolysaccharide-stimulated intestinal epithelial cell-18 cells. Values are expressed as the means ± SD (n= 3). *P< 0.05 compared with the experiment group; **P< 0.01 compared with the experiment group; #P< 0.01 compared with the control group
