Anticipated results from Step 27 showing the DNase I random fragmentation of amplified ds-cDNA on an agarose gel. Serial dilutions of DNase I (Epicentre) were used for fragmentation at 37°C for 5 min, and different levels of fragmentation were observed as shifted DNA smears. Lane M, 1 kb DNA ladder from New England Biolabs. Lane 1, 1 U of DNase per μg of DNA; lane 2, 0.1 U of DNase per μg of DNA; lane 3, 0.01 U of DNase per μg of DNA; lane 4, 0.001 U of DNase per μg of DNA; lane 5, 0.0001 U of DNase per μg of DNA; lane 6, no DNase control.