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Generation of PX DNA by reciprocal exchange. This illustrates the consequences of performing a crossover at every possible juxtaposition in the same-polarity case. The result is the remarkable PX structure, drawn with green and red strands that are related to each other by a dyad axis vertical in the page. This is a paranemic joining of two backbone structures, and it is very stable. This figure is adapted from Fig. 6 of Seeman. (16).
