4. Automated Interpretation of CID Spectra 282 5. Accurate Mass Tags 282 C. Protein Identification in Complex Mixtures 282 D. Analysis of Protein Expression 284 III. Proteomes and Post-Translational Modifications 285 A. Proteomes 285 1. The Analytical Challenge 285 2. Analysis of Protein−Protein Complexes 286 B. Post-Translational Modifications 286 1. Background 286 2. Detection and Purificatio...