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Distribution of O, N, or S atoms around the N atoms of the His side chains. Distances of the nearest atoms to each Nδ (closed circles) or Nε (closed squares) of His side-chain that are in the χ2 = 0°±10° conformation (371 data points) were binned to 0.2 Å and compared with those for all (10101 data points) His entries (open circles and squares for Nδ and Nε, respectively).
