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                      | mitochondrial 
                        creatine kinase (mtCK) |   
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                            |  | A protein found in the mitochondria that exists 
                              in two forms. The first form prevents the mitochondrial 
                              membrane from destabilizing. When mtCK is inactivated 
                              by free radicals, it transforms to the second form, 
                              making the membrane less stable. |  |   
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