Genomic DNA was extracted from sorted hematopoietic cells and amplified using Phusion PCR Master Mix (Thermo Fisher Scientific, #F-531 L). PCR reactions were halted once they had progressed halfway through the exponential phase. The PCR product was purified and analyzed using an Illumina NextSeq 500 at the USC Epigenome Center. Sequencing data were analyzed, as previously described (37 (link)–39 (link)). The lentiviral vector that delivers genetic barcodes also conveys GFP expression that marks barcoded cells.
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