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The tangled web of interrelationships among segmental duplications containing the 7E subfamily of olfactory receptor genes illustrates a complex history of duplications and exchanges. This plot shows the 19 7E segmental duplications (SDs) that contain at least one segment of 10 kb, including repeats, that match another 7E SD. Only the most similar match for each segment is depicted for simplicity. The 7E SDs are plotted as the differently colored thick arcs making up the circle, and matches are connected by curved lines, each terminating in an external arc of the same color as the corresponding 7E SD. (For additional details, see Newman and Trask, pp. 781–793.)