Deltamass is a database of protein post-translational modifications at
http://www.abrf.org/index.cfm/dm.home which can be accessed to determine whether post-
translational modifications are present. There are hyperlinks to references to the modifications.
There is also a prediction program ‘findmod’ for finding potential protein post-translational
modifications in the ExPASy suite at http://expasy.org/tools/findmod/
Information and protocols for sample clean-up are found at http://www.millipore.com/catalogue/
module/c5737 and http://www.nestgrp.com/protocols/protocol.shtml#massspec
Products for Phosphorylated Peptide and Protein Enrichment and Detection IMAC columns and
chromatography at http://www.piercenet.com/files/phosphor.pdf and GelCode Phosphoprotein
Staining Kit. http://www.piercenet.com/398 Mass spectrometric techniques