The mean total RNA concentration was 96 ng/µL while A260/A280 and A260/230 ratios ranged from 1.99 to 2.04 and 2.02 to 2.16, respectively. Therefore all samples were pure, free from protein and organic pollutants derived from RNA extraction. The RIN obtained for all samples ranged from 7.2 to 8.2 with a mean value of 7.6.