CaptureSeq is a targeted RNA sequencing method that is able to provide higher sequencing coverage for selected regions of the genome. This method follows the TruSeq RNA sample preparation protocol, in which mRNA is first isolated from total RNA by poly(A) selection and then fragmented. Double-stranded cDNA copies of the fragments are generated using reverse transcriptase and then ligated to p5 and p7 adapters. Next, these cDNA library fragments are amplified by the polymerase chain reaction (PCR). To increase specificity, custom capture probes are hybridized to the cDNA and bound to an array while other transcripts are washed away prior to PCR amplification. This process leaves the targeted fragments that are ready for sequencing.