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För att se som det är samma fördelning av DNA-småbitar i DNA prover. En gel, en elektrisk spänning över gelen med plus och minuspol. Vätskan i och kring gelen är lite basisk = alla DNA-bitar som placeras i vätskan får negativ laddning. Elektriska spänningen slås på och DNA-bitarna börjar vandra i gelen, från minus mot pluspol. Man kan få fram ett molekylärt fingeravtryck.
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