Ten-fold diluted sensitivity test of Lane M, 100 bp step DNA Ladder maker (Genepia, Korea); lane 1, undiluted RNA temlpate; lane 2, 10−1; lane 3, 10−2; lane 4, 10−3; lane 5, 10−4; lane 6, 10−5; lane 7, 10−6; lane 8, 10−7; lane 9, negative control; dot, selected primer set.