title: Surprise ending.
authors.forename: John M
authors.initials: JM
authors.lastname: Sedivy
authors.forename: Dorothy E
authors.initials: DE
authors.lastname: Shippen
authors.forename: Eugene V
authors.initials: EV
authors.lastname: Shakirov
mesh_terms: D000483:Alleles; D002455:Cell Division; D016922:Cellular Senescence / Q000502:physiology*; D002875:Chromosomes / Q000235:genetics*; D004261:DNA Replication; D005347:Fibroblasts / Q000166:cytology*; D014644:Genetic Variation; D006801:Humans; D009154:Mutation; D016615:Telomere / Q000502:physiology*