Bulk RNAseq was performed on frozen muscle biopsy specimens as previously described.6 (link),9 (link)–13 (link) Briefly, RNA was extracted with TRIzol. Libraries were either prepared with the NeoPrep system according to the TruSeq Stranded mRNA Library Prep protocol (Illumina, San Diego, CA) or with the NEBNext Poly(A) mRNA Magnetic Isolation Module and Ultra II Directional RNA Library Prep Kit for Illumina (New England BioLabs, ref. #E7490, and #E7760).
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