SRR067320 GSM602672_1 SRX027456 GSM602672: H3K27me3 ChIPseq in human ES cells quality_book_char @ quality_scoring_system log odds SRR067321 GSM602673_1 SRX027457 GSM602673: H3K79me2 ChipSeq in human ES cells quality_book_char @ quality_scoring_system log odds SRR067322 GSM602674_1 SRX027458 GSM602674: Suz12 ChipSeq in human ES cells