Fig. 2From: Site-specific His/Asp phosphoproteomic analysis of prokaryotes reveals putative targets for drug resistanceMS/MS spectra of a representative phosphohistidine peptide from H. pylori. The presence of y4-, y5, b5- and b6-ions enables pinpointing the phosphorylation at the indicated histidine residue. Spectra of other phosphopeptides can be found in Additional file 1 Back to article page