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Snapshots of the in silico forced extension of single PYP molecules along different axes. (Right) 36/128 axis. Pull distances, from top to bottom, are 0, 0.6, and 1.2 nm. The red lines represent hydrogen bonds between β-strands 1 and 6. (Left) 48/85 axis. Pull distances, from top to bottom, are 0, 1.2, and 4.6 nm. The pullling rate is 0.1 Å/ps; the simulation time is 1 ns.
