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The defect is that hemoglobin (the protein) elongates. Instead of being circular, it acquires a crescent shape. With this shape, its harder for it to absorb and release oxygen. Also, when the blood cell reaches the capillaries, it can't fit through as well as normal blood cells can, which is why Sickle-Cell is painful.

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Q: Explain the defect in the protein of Sickle-cell disease?
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