We prepared a library using 1 μg K-562 total RNA plus 2 μl of 1:100 diluted ERCC spike-in mix 1 (Ambion) using the TruSeq RNA-Seq kit (Illumina) with the following modifications. (1) The rRNA was depleted using the RNase H method19 (link) instead of using oligo (dT) selection. (2) We eluted the rRNA depleted RNA from the SPRI beads using EPF buffer from the TruSeq kit and heated at 70°C for 10 minutes. (3) We used a different set of barcoding indices rather than those in the TruSeq kit for the ligation and final PCR steps.