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. 2016 Aug 10;291(40):21234–21245. doi: 10.1074/jbc.M116.741041

FIGURE 5.

FIGURE 5.

The formation of stabilizing hydrogen bond in [S39_PQ]IGF-II. The hydroxyl proton from the Ser29 side chain is stabilizing the C-loop via a hydrogen bond to the backbone carboxyl groups either from Pro31 or Arg42.