27. FIGURE 2. Variation of maximal lifespan across species. From the following article: Stem cells, ageing and the quest for immortality Thomas A. Rando Nature 441, 1080-1086 (29 June 2006) doi:10.1038/nature04958
28. Stem cells, ageing and the quest for immortality Thomas A. Rando Influence on Stem Cell Functionality