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An animated sequence demonstrates how electrophoresis separates charged molecules as they move through a gel toward positive or negative poles within an electrified chamber. Shows the differences between horizontal and vertical systems, agarose and polyacrylamide gels, and staining with Coomassie blue or methylene blue. Time lapse photography demonstrates a protein sample separation and explains the analysis. 12 minutes. An excellent aid to visualizing and understanding the procedures involved in electrophoresis, a powerful tool for the separation and analysis of nucleic acids and proteins. Especially useful for viewing by novices before they conduct their first electrophoresis lab, or as a starting point for lengthy discussions of the subject.