Table 1. PCR Primers.

Gene	Primer (5′-3′)
TGF-β receptor 1 (TβR1)	For: TGTCTCCAAATCCAACTCCTC
	Rev: GACTGGCCCTACCTCACCTAT
TGF-β receptor 2 (TβR2)	For: CAGAGTGAAGCCGTGGTAGGT
	Rev: CTGTGAGAAGCCGCAGGAAGT
Smad2	For: AAGCCATCACCACTCAGAATTG
	Rev: CACTGATCTACCGTATTTGCGT
GAPDH	For: GCAAGTTCAACGGCACAG
	Rev: CGCCAGTAGACTCCACGAC