Cis-existence of H3K27me3 and H3K36me2 in mouse embryonic stem cells revealed by specific ions of isobaric modification chromatogram. - Hailei Mao; Gang Han; Longyong Xu; Duming Zhu; Hanqing Lin; Xiongwen Cao; Yi Yu; Charlie Degui Chen (Stem Cell Research & Therapy, 2015)