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In page Hereditary spherocytosis:

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These proteins are necessary to maintain the normal shape of a red blood cell, which is a biconcave disk. The integrating protein that is most commonly defective is spectrin which is responsible for incorporation and binding of spectrin to the greater actin cytoskeleton. This dysfunction of cytoskeletal instabilities ensue, and leave the plasma membrane of the cell less supported and/or weakened.[citation needed]