AUTHOR=Chaube Ruchi TITLE=Absolute quantitation of post-translational modifications JOURNAL=Frontiers in Chemistry VOLUME=2 YEAR=2014 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2014.00058 DOI=10.3389/fchem.2014.00058 ISSN=2296-2646