FIGURE 1.

Various stress combinations induce cross-tolerance in the fission yeast. Viability of wild-type (JK317) cells following exposure to indicated stress is shown. Priming stress was 40 °C, 0.6 m KCl, or 0.1 mm H₂O₂ for 1 h, and severe stress was 46 °C, 2.4 m KCl, or 25 mm H₂O₂ for 1 h. Results are the means of at least four independent experiments, and error bars represent S.E. Significant difference between viabilities with or without priming stress was determined by Student's t test (*, p < 0.05, **, p < 0.01).