(A,B) From the top to bottom: the three lowest energy binding modes for s-NGF(1-14)/TrkA-D5 (A) and NGF(14-1)/TrkA-D5 (B) complexes, respectively. TrkA-D5 backbone is shown by yellow ribbons, each residue is shown by silver sticks. The s-NGF(1-14) and NGF(14-1) backbones are shown in blue and ice blue, respectively. Carbon atoms are shown in green, nitrogen atoms in blue, and oxygen atoms in red. (C) The number of non-covalent intermolecular interactions calculated for s-NGF(1-14)/TrkA-D5 and NGF(14-1)/TrkA-D5 compared with those calculated for the complex NGF(1-14)/TrkA-D5 [20].