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Scores for muscle histopathology in gluteal or semimembranosus muscle of 6 horses with myotonic dystrophy (eMD) and controls as well as scores for triceps muscle in 4 eMD horses. Scoring system was 0 = not present, 1 = mild alterations were present in 50% of 10X fields. Statistical comparisons were performed with a Mann Whitney test. Differentially Expressed Genes in eMD versus controls (FDR ≤ 0.01) with Log2 fold change and adj P values. Gene ontogeny enrichment analysis for upregulated genes organized by functional categories. Gene ontogeny enrichment analysis for down regulated genes organized by functional categories. Significant differentially expressed proteins in eMD versus controls organized by functional group. (XLSX)