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Set within a slice of phospholipid bilayer, this aquaporin water channel protein model shows how water crosses the cell membrane. Rows of round lipid heads line the top and bottom with wavy tails between them, while the lumpy protein pore stands in the middle, split open to reveal a single-file line of water beads running through it. Organic and clear, it gives a cell biology class a hands-on look at membrane transport, and suits any science display shelf.

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