Schlaffner, C. N., Pirklbauer, G. J., Bender, A., Steen, J. A., Choudhary, J. S. A Fast and Quantitative Method for Post-translational Modification and Variant Enabled Mapping of Peptides to Genomes. J. Vis. Exp. (135), e57633, doi:10.3791/57633 (2018).