Sodium-potassium ion pump proteins, molecular model. Sodium-potassium ATPase (adenosine triphosphatase) is an ATP-powered ion pump found in all animal cells. It is responsible for maintaining the high concentration of potassium ions and low concentration of sodium ions within the cell by 'pumping' these ions in opposite directions across the plasma membrane, against their concentration gradient. This process is a form of active transport. Shown here is the alpha subunit and the beta subunit with another membrane protein.
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達志影像
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