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Gene duplication has different outcomes: pseudogenization (death of one of the two copies), gene amplification (both copies remain the same), sub-functionalization (both copies are required to perform the ancestral function) and neo-functionalization (one copy acquires a new function). Asymmetric evolution (one copy evolves faster than the other) is usually seen as a signature of neo-functionalization...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.