Figure 4

Examples of minimum mutation cost labelings of the nodes of a species tree. Right and left trees show two minimum mutation cost labelings of the nodes of the species tree for the adjacencies (g h) (left labeling) and (g −h) (right labeling) conserved at the ancestral node in the species tree depicted in Figure 1. For each labeling, the edges of tree with a change of state are in dashed line. The cost of the left labeling is 3, and the cost of the right labeling is 2.