A total of 1 µg of RNA per sample was used to synthesize 50-bp-long single-end mRNA libraries with an Illumina TruSeq Stranded mRNA Library Prep Kit. The integrity and quantity of the libraries were determined on the Bioanalyzer using the DNA 12000 Kit (Agilent). The barcoded libraries were pooled and sequenced on an Illumina HiSeq 4000, with an average depth of 20 million reads per sample. The raw reads were mapped to the human genome build GRCh38, and gene level counts were determined using Spliced Transcripts Alignment to a Reference, version 2.5 (71 (link)). Subsequent data processing followed the method outlined in ref. 72 (link).
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