Table I.

Primer sequences for RT-PCR.

Gene names	Forward sequences	Reverse sequences
TGF-β1	5′-ATGTGCAGGATAATTGCTGCC-3′	5′-TGGTGTTGTACAGGCTGAGG-3′
Smad7	5′-TGGTGCGTGGTGGCATACTGG-3′	5′-GACTCTTGTTGTCCGAATTGAGCT-3′
β-actin	5′-TCAGGTCATCACTATCGGCAAT-3′	5′-AAAGAAAGGGTGTAAAACGCA-3′

TGF-β1, transforming growth factor-β1; RT-PCR, reverse transcription-polymerase chain reaction.