DNA is sheared at the and that enough DNA is left after a first cleanup with Ampure XP beads. The second QC step ensures that a successful adapter ligation is achieved and sufficient adapter-ligated DNA remained for the upcom ing hybridization. The third QC step verifies that enough DNA is retained from the hybridization and amplification steps in a second PCR and that the size of the resulting final library is in the optimum range for paired-end sequencing. Parameters that are quantified from readings of the Bio- analyzer (DNA 1000 assay) (Agilent; Waldbronn, Germany) platform include amount of sheared DNA and the smallest and largest fragment size of the sheared DNA; the amount