Rapamycin fed late in life extends lifespan in genetically heterogeneous mice. - Harrison, David E.; Strong, Randy; Sharp, Zelton Dave; Nelson, James F.; Astle, Clinton M.; Flurkey, Kevin; Nadon, Nancy L.; Wilkinson, J. Erby; Frenkel, Krystyna; Carter, Christy S.; Pahor, Marco; Javors, Martin A.; et al. (Nature, 2009)