Peptide position 3. The α chain residues are shown in light blue, the β chain residues – in darksalmon. The dimorphic Met/Val76β is shown in green. Glu55α (given in magenta) makes a H-bond with p3 residue Tyr (given as TYR-5 in orange).
Patronov et al. BMC Structural Biology 2012 12:20 doi:10.1186/1472-6807-12-20