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Figure 2


Fig. 2. Duplication–degeneration/complementation model of Force, Lynch, and colleagues (e.g. Force et al., 2005; Force et al., 1999). (A) After duplication, if one duplicate retains the original function, the other may either evolve a new function or deteriorate. (B) After duplication of a gene or module with multiple functions, the duplicates may each evolve distinct functions as long as each function of the ancestral gene/module continues.