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<p>When one woman has a mutation gene in one x chromosome, it could be recovered by the other x chromosome.</p>
<p>For example, Duchenne dystrophy is a severe muscular atrophy. It results from X chromosome-related <em>DYSTROPHIN</em> mutation<sup>6)</sup></p>
<p>Most of the heterozygous women who have only one <em>DYSTROPHIN</em> mutation gene don't show the symptom because they have the cells which select normal <em>DYSTROPHIN</em> gene and the cells can help nearby mutated cells</p>
<p>5) https://www.youtube.com/watch?v=RyAvKGmAElQ&feature=related</p>
<p>6) Nessa, Carey. <strong>The Epigenetics Revolution</strong>, 247p, Bookhouse Publishers, 2011</p>