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My muscle biopsy came back negative for MD. My doctor (neurologist) said I'm a mystery. He's suspecting some protein defect somewhere along the pathway of energy production in the cells. He's thinking a mitochondrial defect. However, my sister and my DAD had/have similar symptoms. Our mitochondria come from our mothers. Hmmmm... He's sending me to a geneticist next month for a genetics work-up. I'll keep you all posted.