Figure 3. C-terminal peptide sequence of HIST1H2BN.

ETD spectrum of the ion (M+6H)⁶⁺ at m/z 547.4 corresponding to the peptide with amino acids 101–128 in HIST1H2BN (GI: 119623520). The positions of z,y (C-terminal) and c (N-terminal) fragment ions are indicated in the spectrum and in the corresponding peptide sequence, where the lower case (ph), (ac/me3), (ub) and (me2) designate modifications of the amino acids by phosphorylation, acetylation/trimethylation, ubiquitination and dimethylation, respectively.