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Effect of BGZLS10-17 supernatant containing bacterial GABA in three concentrations (1, 2, and 4 mM) on the expression of tight junction proteins. mRNA expression levels of zonulin (A), occludin (B), and claudin 4 (C) and representative western blot showing claudin 4 protein expression (D) in differentiated Caco-2 cells. The statistical significance of mRNAs expression is shown (∗p < 0.05; ∗∗∗p < 0.001); bact., bacterial.
