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Electrophoresis analysis is a method that is used to separate proteins of differing sizes and/or charges. A sample of the protein, often DNA or RNA, is placed in wells at one end of a gel. An electric current is applied that repels the proteins and causes them to move down the gel. By comparing the gel with the protein spread through it to a reference or standard sample, an identification can be made. Electrophoresis analysis is used in forensics to compare DNA, in medical laboratories to do genetic testing, and in microbiology labs to identify microorganisms. In addition to analyzing proteins or DNA, electrophoresis is also used to create purified samples of proteins.