Current trends in differential expression proteomics: isotopically coded tags.

Isotopically coded tag methodology holds significant promise for differential expression proteomic experiments. This methodology has the potential for high sensitivity, high coverage, and high throughput. Although significant technical advances have been made in the past year, this approach must be viewed as an emerging technique. Advances in sample fractionation, both at the protein and peptide level, and improved data acquisition schemes, will all be required before the full potential of the method is realized.