“…For instance, helix to coil transitions can be controlled by means of pH changes for poly( l -glutamic acid) PGA [ 7 , 8 ] and poly ( l -lysine) PL [ 9 ]. Recent developments in this direction include the use of polypeptide polymers to enable a structuring switch upon biologically relevant stimuli changes [ 1 , 10 , 11 , 12 , 13 ], including redox changes [ 14 , 15 ], metal coordination [ 16 ] or DNA binding [ 17 ].…”