Figure 3 .

Spontaneous products are crossovers between the two duplicated copies. The two parental copies of the nbs-Ilp region are shown on the top with the four pieces of sequence heterology labeled according to their approximate distance from the left end of the nbs-Ilp region. The physical distance between heterologous sites is shown in kilobases below the diagram for the parental copies. (Bottom) Another representation of the nbs-Ilp parental copies and their five crossover products with each heterology depicted as a solid circle. The three types of reduction product have been defined in Figure 2. The number to the right of each product represents the number of lines identified for each outcome.