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Determination of the cos site. Two runoff Sanger electropherograms on linear phage DNA prepared from infectious particles identified the cos site boundaries. (a and c) Runoff electropherograms. (b) Manually enhanced traces identified the cos sequence. The figure is drawn to scale, and individual boxes are placed in relation to their expected sequence positions. Trace files were visualized using Chromas (http://www.technelysium.com.au/).
