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| Modern Genetic Analysis Chapter 10. Recombinant DNA Technology Using Cloned DNA Figure 10-17. Mixtures of different-sized DNA fragments separated electrophoretically on an agarose gel. In this case, the samples are five recombinant vectors treated with EcoRI. The mixtures are applied to wells at the top of the gel, and fragments move under the influence of an electric field to different positions dependent on size (and, therefore, number of charges). The DNA bands have been visualized by staining with ethidium bromide and photographing under UV light. (M represents lanes containing standard fragments acting as markers for estimating DNA length.) (From H. Lodish, D. Baltimore, A. Berk, S. L. Zipursky, P. Matsudaira, and J. Darnell, Molecular Cell Biology, 3d ed. Copyright © 1995 by Scientific American Books, Inc.)

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