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Raw  FASTQ  files  were  demultiplexed  using  the  FASTX-Toolkit  (http://hannonlab.
cshl.edu/fastx_toolkit/) and processed to contain only the unique sgRNA sequence. To align the
processed reads  to  the  library,  the designed sgRNA sequences from  the  library were assembled
into  a  Burrows-Wheeler  index  using  the  Bowtie  build-index  function.  Reads  were  then
aligned  to  the  index using  the Bowtie aligner. After alignment,  the number of uniquely aligned
reads for each library sequence was calculated.
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