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Agarose gel electrophoresis is most commonly done horizontally in a subaquaeous mode whereby the slab gel is completely submerged in buffer during electrophoresis. It is also possible, but less common, to perform the electrophoresis vertically, as well as horizontally with the gel raised on agarose legs using an appropriate apparatus. [ 27 ]
Gel electrophoresis of large DNA or RNA is usually done by agarose gel electrophoresis. See the " chain termination method " page for an example of a polyacrylamide DNA sequencing gel. Characterization through ligand interaction of nucleic acids or fragments may be performed by mobility shift affinity electrophoresis .
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To the right of the marker, there are three examples of different DNA samples: Sample A, Sample B and Sample C. The image displays how smaller DNA fragments move farther throughout the agarose gel than the larger fragments of DNA. These distances can be used to identify or match specific DNA sequences.
Gels have conventionally been run in a "slab" format such as that shown in the figure, but capillary electrophoresis has become important for applications such as high-throughput DNA sequencing. Electrophoresis techniques used in the assessment of DNA damage include alkaline gel electrophoresis and pulsed field gel electrophoresis.
Gel conditions are 1% agarose, 3 volt/cm, and ethidium bromide stain. A molecular-weight size marker, also referred to as a protein ladder, DNA ladder, or RNA ladder, is a set of standards that are used to identify the approximate size of a molecule run on a gel during electrophoresis, using the principle that molecular weight is inversely ...
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