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How are the effects of PKU and Tay-Sachs disease similar ?

How are the effects of PKU and Tay-Sachs disease similar ?-example-1
User Unwired
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Tay-Sachs destroys nerve cells in the brain & spinal cord. Pku is a birth defect that causes amino acids to build up in the body. They are similar because you can get seizures from both & in both there is also slow growth. 
User Rifinio
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