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PR toxin production in different Penicillium roqueforti strains

Different Penicillium roqueforti strains from the American Type Culture Collection were tested for the production of PR toxin. All four strains were able to produce the toxin on semisynthetic medium at 24 degrees C after certain periods of incubation. The yields were correlated with the pH of the medium. Timing of the harvest influenced both the yield and purification of the toxin.