Files in this Data Supplement:

• Supplemental file 1 - Fig. S1 (DDp53 and DNp53 are equally potent at overcoming proliferation arrest by low levels of replicational stress), S2 (Senescence morphology induced by replicational stress is largely dependent on p53 activity), S3 (Induction of γ H2A.X foci by low-level replicational stress), S4 (Inhibition of checkpoint signaling does not prevent proliferation arrest by low levels of replicational stress), S5 (Down-regulation of p21 does not prevent activation of p53 by replicational stress), and S6 (Proliferation arrest induced by chronic replicational stress does not require Rb)
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