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Figure 10.7. Top: The variable regions are flanked by conserved heptamer (7 bases) and nonamer (9 bases) regions, which are needed for recombination. Between those are regions of either 12 or 23 bases. A segment with a 12 base region is joined with a region with 23 bases during recombination. Bottom: There are two possible mechanisms of recombination, one results in the loss of the intervening sequences, the other does not.

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