SRX5172968 GSM3526302 SRP174172 SRS4180446 GSM3526302 RNA-Seq TRANSCRIPTOMIC cDNA Total RNAs were purified from sub-confluent MEFs using standard methods. Libraries of template molecules suitable for strand-specific high-throughput DNA sequencing were created using a TruSeq Stranded Total RNA with Ribo-Zero Gold Prep Kit (RS-122-2301; Illumina) as previously described (Ors et al. 2017). Illumina HiSeq 4000 gds 303526302 GSM3526302 GEO Accession GSM3526302 SRX5172969 GSM3526303 SRP174172 SRS4180445 GSM3526303 RNA-Seq TRANSCRIPTOMIC cDNA Total RNAs were purified from sub-confluent MEFs using standard methods. Libraries of template molecules suitable for strand-specific high-throughput DNA sequencing were created using a TruSeq Stranded Total RNA with Ribo-Zero Gold Prep Kit (RS-122-2301; Illumina) as previously described (Ors et al. 2017). Illumina HiSeq 4000 gds 303526303 GSM3526303 GEO Accession GSM3526303 SRX5172970 GSM3526304 SRP174172 SRS4180447 GSM3526304 RNA-Seq TRANSCRIPTOMIC cDNA Total RNAs were purified from sub-confluent MEFs using standard methods. Libraries of template molecules suitable for strand-specific high-throughput DNA sequencing were created using a TruSeq Stranded Total RNA with Ribo-Zero Gold Prep Kit (RS-122-2301; Illumina) as previously described (Ors et al. 2017). Illumina HiSeq 4000 gds 303526304 GSM3526304 GEO Accession GSM3526304 SRX5172971 GSM3526305 SRP174172 SRS4180448 GSM3526305 RNA-Seq TRANSCRIPTOMIC cDNA Total RNAs were purified from sub-confluent MEFs using standard methods. Libraries of template molecules suitable for strand-specific high-throughput DNA sequencing were created using a TruSeq Stranded Total RNA with Ribo-Zero Gold Prep Kit (RS-122-2301; Illumina) as previously described (Ors et al. 2017). Illumina HiSeq 4000 gds 303526305 GSM3526305 GEO Accession GSM3526305