Metzger, E., et al. Phosphorylation of histone H3 at threonine 11 establishes a novel chromatin mark for transcriptional regulation. Nat Cell Biol 10, 53-60 (2008), Drosophila Spike in Chromatin was added in H3K9me3 control and H3K9me3 (i) samples. Libraries were prepared from immunoprecipitated DNA according to standard methods. ChIP-seq libraries were sequenced using a HiSeq 2000 (Illumina) and mapped to the hg19 reference genome using bowtie 2