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Mutant fruit flies (mutant) with genetic changes to antioxidant enzyme Cu/Zn superoxide are less stress resistant and live shorter lives than normal wild-type (wild) flies (top panel). Mutant lifespan is improved by social contact with young wild-type individuals, but not by contact with old wild-type flies (mid panel). Contact with disabled wild-type flies can shorten the lifespan of mutants even more (bottom panel).
