A compendium thirty-four powerful techniques for identifying and analyzing the diversity of proteins expressed in cells. Thee readily reproducible proteomic methods range from general to specific techniques, and include methods for data analysis, posttranslational modification, and its variants and isoforms. Additional methods demonstrate the application of proteomics to the discovery of serological tumor markers, to identifying the determinants of sensitivity to antitumor drugs, and to specialized fields, such as endocrinology, plant biology, nephrology, and urology.