<prompt> Histone has post-translational modification by all exceptAcetylationmethylationPhosphorylationGlycosylation  <response>: Amino-terminal tails of histones are available for regulatory covalent modification by Acetylation, phosphorylation, ADP-ribosylation, methylation, monoubiquitylation and sumoylation.Note:- Sumoylation means conjugation with SUMO i.e. small ubiquitin-related modifier. 