In {TAIL ~ other embodiments}, {HEAD ~ X4} is selected from a neutral D amino acid, a positively charged D amino acid and an aromatic D amino acid 
In
In { TAIL ~ other embodiments } , { HEAD ~ X4 } is selected from a neutral D amino acid , a positively charged D amino acid and an aromatic D amino acid
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH