Health warning; Abbreviations; An introduction to polyacylamide gel electrophoresis; Gel isotachophoresis; Analytical and preparative gel electrofocusing; Two-dimensional gel electrophoresis; Peptide mapping by limited proteolysis using SDS-polyacrylamide gel electrophoresis; Immunoelectrophoresis; Appendix 1: Bibliography of polypeptide detection methods; Appendix 2: Reagents for the isotopic labelling of proteins; Appendix 3: Molecular weights and isoelectric points of selected marker proteins; Appendix 4: Suppliers of specialist items for electrophoresis