Figure 5: Evolution of the hydrogen bond length between thrombin and L86 under AMBER (black) and PPC (red).
From: Large-scale molecular dynamics simulation: Effect of polarization on thrombin-ligand binding energy

(A) The hydrogen bond formed between L86O1 and G216N, G216H. (B) The hydrogen bond formed between G216O and L86N1, L86H9. (C) the hydrogen bond formed between S214O and L86N4, L86H13.