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Comparison of the quaternary arrangement in tetra- and nonasulfide bridged Bet v 1. a, the tetrasulfide bridged dimer is stabilized by anti-parallel β-sheet formation, with an interface of 536 Å2. b, the nonasulfide bridged Bet v 1 is rotated along the sulfide bridge for ∼135°, resulting in a larger interface (670 Å2) and the loss of the intermolecular β-sheet extension. c, all nine sulfur atoms are resolved in the 1.17 Å resolution electron density.
