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mtDNA deletion load in single muscle fibers from EOM and skeletal muscle (SKM) samples of four patients: 2, 3, 4, and 12. The mean percentage deletions in COX-deficient EOM fibers was significantly lower than in COX-deficient skeletal muscle fibers (P < 0.0001). There was no difference in deletion load in the COX-positive muscle fibers from these two groups (P = 0.124).
