The scientists at 21st Century Biochemicals are experienced in a variety of MS analyses. These include mass determination, peptide mapping, sequence determination, and post-translational modification analysis. Determination of glycosylation, phosphorylation, acylation and many other posttranslational modifications are possible. The scientists are also quite adept at the separation and purification of components from complex mixtures, such as cytosol, the luminal contents of subcellular fractions, and extracellular media. In these cases, sample preparation is key to success.