This book describes the principles and reactions for most techniques of protein extraction, purification, and characterization. The second edition covers modern techniques that are extensively used in protein identification and analyses including NMR, mass spectrometry, recombinant protein, and database search. It incorporates NMR and mass spectrometry for protein identification, use of computers and websites for protein annotation, and identification of commonly modified proteins. The text also expands coverage of the recombinant proteins. Two new chapters address the identification and annotation of the target protein and the identification of other posttranslational modifications.