Data S1 Discussion.

Fig. S1 Data on growth, telomere length and telomerase expression for 43 species.

Fig. S2 Resistance to tert-Butyl hydroperoxide and sodium arsenite.

Table S1 Species, mass and lifespan.

Table S2 PGLS analysis of individual non-placental mammalian orders.

Table S3 Species analyzed for resistance to oxidative stressors.

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