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Transcription of claudin-1 and occludin in the intestine of the preterm and term germ-free piglets. The preterm piglets (n = 10) are shown in the gray column, and the term piglets (n = 6) by the white column (A,B). The results are presented as the mean + SEM. The statistically significant differences in claudin-1 transcription in the ileum are denoted with an asterisk (P < 0.05).
