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Band III protein (medicine)


band III protein
<protein> A 90 kD protein embedded in the surface of the human erythrocyte membrane, identified as the major anion transport/exchange protein. When the red blood cell is in the lungs, brings chlorine ion into the cell in exchange for bicarbonate.

Analogous proteins exist in other erythrocytes. A dimeric transmembrane glycoprotein, with binding sites for many cytolasmic proteins, including ankyrin, on its cytoplasmic domain.