Figure 4From: Reconstruction of ancestral gene orders using intermediate genomesPossible ways of applying a DCJ operation on adjacencies pq and rs. (a) The initial BP(A, B); (b) Applying DCJ {pq, rs} → {ps, qr} on genome A; (c) Applying {pq, rs} → {pr, qs} on genome A; The DCJ in (b) is optimal, increasing the number of cycles by one. The DCJ in (c) is not, and introduces crossing edges.Back to article page