We targeted chr4.hg19:46918163-47005187 encompassing 74kb of GABRA4 (NM_000809) and 10kb upstream and 5kb downstream of the gene with long-range PCR. Ten tiled primer pairs each amplifying ~8.7kb were designed using Primer3 software (http://frodo.wi.mit.edu) [32 (link), 33 (link)] (Online Resource 1) and synthesized by IDT (Integrated DNA Technologies, Coralville, IA, USA). PCR was performed using the Expand Long Range dNTPack PCR kit (Roche Applied Science, Indianapolis, IN, USA) on Veriti 96-Well Fast Thermal Cyclers (Life Technologies, Carlsbad, CA, USA). PCR products were visualized on 0.75% agarose-ethidium bromide gel and primer dimer and nonspecific products removed with the NucleoFast 96 PCR kit (Machery-Nagel, Bethlehem, PA, USA) following standard manufacturer protocol for a vacuum manifold.