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Motions of NlacP2 side chains as a function of simulation time. The side chains of S55 and S55` form a hydrogen bond around 900 ps. Note that the interaction between S55 O and S55` OH is symmetrically equivalent to that between S55 OH and S55` O. The dashed lines at 2.5 Å represent the length of an average hydrogen bond. Also around 900 ps, the side chains of V52 and V52` are stabilized in close proximity to each other.
