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Hayden Lord was born with it. If one letter in the DNA is "messed up" it can cause cetain proteins NOT to develop. Tay-Sach's disease causes fat to swell up in the brain. Hayden was blind, can't take in solid food and has at least 10 seizures a day. His parents are both carriers of the disease, which means that they can pass on the traits to their descendants. Hayden died before his third birthday.

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13y ago

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