We used the Covaris E210 AFA instrument (Woburn, MA) (Quail et al. 2008 (link), 2009 ; Fisher et al. 2011 (link)) to shear the DNA into fragments of a desired length. A previous study on automated 454 library preparation (Lennon et al. 2010 (link)) showed that it is possible to use 96-well PCR plates on the E210, and we adapted the method to another plate type and a shorter fragment size (Supplemental Notes, “DNA Fragmentation”). This reduces consumable costs for the shearing step by ∼90-fold compared with the microTUBE plates provided by Covaris.