SRR067348 GSM602777_1 SRX027460 GSM602777: ChIP-Seq for E2F4 in 2nd MEF SRR067349 GSM602778_1 SRX027461 GSM602778: ChIP-Seq for H3K27me3 in 2nd MEF quality_book_char @ quality_scoring_system log odds SRR067350 GSM602779_1 SRX027462 GSM602779: ChIP-Seq for RNA Pol II in 2nd MEF SRR067351 GSM602780_1 SRX027463 GSM602780: WCE in 2nd MEF 1 SRR067352 GSM602781_1 SRX027464 GSM602781: WCE in 2nd MEF B2 quality_book_char @ quality_scoring_system log odds