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Increased thermotolerance acquired by strain ANB1-79a. Synechococcus wild-type (○), ΔclpB1 (□), ANB1-93 (▿), and ANB1-79a (▴) cultures grown at 37°C were preheated at 48.5°C for 90 min and then shifted to 54°C for 15 min. Average numbers of viable cells after each temperature treatment are expressed as percentages of the 37°C control value (100%). Values represent averages ± standard errors (n = 3).
