The doubly modified dimethyl K9, phospho-T6 histone H3 is known to exist, but very little comprehensive information about the importance of this modification and its mechanism has been published. H3K9me2 is a histone post-translational modification that is enriched in transcriptionally inactive regions. It is also important in cellular differentiation and maturation. Phosphorylation of histone H3 is also associated with mitosis and meiosis, and seems to be related to developmental changes. The dual modification of H3T6pK9me2 is still under investigation and will present more insight into the complex epigenetic code.