Figure 4:
a) Structures of Gramicidin A (gA) Head-to-Head Dimer Helices (PDB ID: 1NRM [50]); side and top view, b) gA Depicted with pore, c) Helical structure of Pro-AzPro 30-residue helix (30 mer) from molecular modeling; side and top view, d) 30 mer Depicted with pore.