Huntington's disease is a defective gene on the fourth chromosome of the body's twenty-three chromosomes. Babies born of a Huntington's parent have a 50-50 chance of developing the disease. A person's normal chromosome count is seventeen to twenty, and anything above that will develop a disease that will slow a person's speech, lead to uncontrollable body movements, a feeding tube, and a very painful death. Emily Balkin had forty-nine C.A.G. repeats on that fourth chromosome. Huntington's will to hit her hard. Mark Tanner knew that going in, and promised that it would not bother him. He would break that promise.
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