Figure 3.

A postulated mechanism for inversions of Region A and Region B. Recombination between two IR-As (or two IR-Bs) produces an isomeric form characterized by a flip-flop of Region A (or Region B). Dual flip-flop inversions of IR-A and IR-B can generate four distinct genome structures.

Hikosaka et al. BMC Genomics 2012 13:622   doi:10.1186/1471-2164-13-622
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