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In contrast to organs, most tissues (with the exception of corneas) can be preserved and stored for up to five years, meaning they can be banked. Also, more than 60 grafts may be obtained from a single tissue donor.
Sickle cells only live for about 15 days, while normal hemoglobin can live up to 120 days. Also, sickle cells risk being destroyed by the spleen because of their shape and stiffness. The spleen is an organ that helps filter the blood of infections and sickled cells get stuck in this filter and die.