Histones and histone modifications Craig L Peterson, Marc-André Laniel  Current Biology  Volume 14, Issue 14, Pages R546-R551 (July 2004) DOI: 10.1016/j.cub.2004.07.007

Figure 1 Post-translational modifications of the core histones. The colored shapes represent known post-translational modifications of the core histones. The histone tails can be methylated at lysines and arginines (green pentagons), phosphorylated at serines or threonines (yellow circles), ubiquitylated (blue stars) and acetylated (red triangles) at lysines. Current Biology 2004 14, R546-R551DOI: (10.1016/j.cub.2004.07.007)