The epigenetic code is hypothesised to be a defining code in every eukaryotic cell consisting of the specific epigenetic modification in each cell.
It consists of histone modifications defined by the histone code and additional epigenetic modifications such as DNA methylation.
[1] The epigenetic code can be multidimensional in nature.
It could include any of the three major cellular macromolecucles; namely, DNA (code independent), RNA, and/or protein.
In some ciliates potential structural codes have also been suggested.