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Fig. 1. Comparison of thermotolerance between P. aurelia syngens. Each
syngen, cultured at 25°C, was incubated at 33°C for 30 min, and then
the incubation temperature was raised stepwise by 1°C and kept constant
for about 10 min. At each temperature, swimming cells were counted and the
temperature at which no cells were swimming was determined as the killing
temperature. Experiments were conducted three times.