for total RNA isolation (SinaClon Bioscience, Iran)
and quality control procedure of the isolated RNA was
undertaken with measurement of the absorbance at
260/280 nm by Biophotometer; the isolated RNA had
an optical density between 1.9-2 with double distilled
water used as blank. Afterward, cDNA was produced
by a GeneAll kit (HyperScriptTM Reverse Transcriptase,
South Korea); cDNA synthesis was done in 20 µl volume
containing 3 µl extracted RNA, 1 µl dNTP, 1 µl oligo dT
and 9 µl nuclease-free distilled water, which was heated
to 65°C for 5 minutes and then placed on ice. After
that, 6 µl of RT buffer including 10X RTase reaction
buffer, DTT, HyperScriptTM Reverse Transcriptase and
ZymAllTMRNase inhibitor were added and incubated for
50 minutes at 55°C followed by 5 minutes at 85°C.