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A sodium potassium pump sits embedded in a wide disc of lipid bilayer, rising above and hanging below the membrane. Smooth, chunky protein domains wrap around a central channel, with strings of round beads along the side marking ions on their way through. Below the membrane, two rounded lobes curl outward with a short bead chain between them. The bilayer is detailed with rows of round heads and wavy tails. A clear teaching model for cell biology lessons and an eye-catching display piece.

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