Fig. 2From: DTL reconciliation repairA fragment of a temporally infeasible reconciliation for a host tree (black) and parasite tree (gray). Node x transfers one child to the species edge from a to b, implying that x must occur before b and thus that c occurs before b. Node y transfers one child to the species edge from a to c, meaning that y must occur before c and thus that b occurs before c, contradicting the constraint that c occurs before b Back to article page