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Credit: Emad Tajkhorshid and Klaus Schulten, University of Illinois, Urbana-Champaign
This illustration captures a snapshot of one of the largest atomic computational simulations ever attempted. The picture graphically depicts "boomerang-shaped" water molecules passing from outside of the cell (top blue area) to inside (bottom blue area) through an aquaporin pore (gold area) -- even as the cell membrane (red areas of diagram) provides an otherwise impermeable barrier between the cell's exterior and interior.
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