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                      | Small to medium or large colonies with a slightly   undulated margin. The variation in colony size on the same agar plate   may give the impression that the culture is impure. |  |  |  | 
              
              
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                      | General characteristics:  Gram-positive. Catalase-positive. Motile. Attacks sugars by fermentation. Bacillus coagulans is facultatively thermophilic growing at temperatures up to 55 - 60°C. |  | 
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