Figure 6From: Reconstruction of ancestral gene orders using intermediate genomes(a) A genome M , in orange, with exactly two crossing edges in BP( A, B ), with A in green and B in blue. (b) A DCJ operation {pr, sq} → {pq, rs} on M that uncross the edges breaks one AM-cycle in two, keeping the other BM-cycle, meaning that M is not an intermediate genome, as shown in Lemma 2.Back to article page