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Stability of beta2 toxin in a culture of C. perfringens strain Cp15 alone (C), in a Cp15 culture to which L. fermentum was added (CL), in the supernatant of a culture of Cp15 alone (S), or in the supernatant of a CP15 culture to which L. fermentum was added (SL). The 0-h time point is the start of the experiment, immediately after the L. fermentum cultures were added. The 2-h time point is after 2 h of incubation starting at the moment the L. fermentum cultures were added.
