What cytosolic protein gives the membrane of erythrocytes its flexibility?

Name: What cytosolic protein gives the membrane of erythrocytes its flexibility?
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Spectrin is a cytoskeletal protein that lines the inner surface of the plasma membrane in eukaryotic cells, including erythrocytes (red blood cells). It is crucial for maintaining the cell's shape and giving the membrane its flexibility, which is essential for erythrocytes to deform as they pass through narrow capillaries.

What Cytosolic Protein Gives the Membrane of Erythrocytes Its Flexibility