Fig. 1. Survival curves of adult Drosophila. iso2: the long-lived iso-female line, maximum lifespan 73 days, mean lifespan 45.53 days; iso4: the short-lived iso-female line, maximum lifespan 62 days, mean lifespan 38.47 days. The differences were significant (P<0.01). Values shown are the means ± S.E.M. of four parallel experiments.