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For Nikki Williams, having a second child was a high-stakes gamble.
Eliza, her first, was born with metachromatic leukodystrophy, a genetic disorder that deteriorated her ability to move or communicate and would eventually lead to her death, at age 10, in July last year. The odds of living through the same nightmare were at least one in four.
"We wouldn't have ever changed having Eliza. We loved her just the way she was," said Williams, 36. "But if there was something we could do to avoid the disease, we wanted to at least try."
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