In other embodiments, {HEAD ~ X6} is selected from a positively charged D amino acid, {TAIL ~ an aromatic D amino acid} and a neutral D amino acid 
In other embodiments , { HEAD ~ X6 } is selected from a positively charged D amino acid , { TAIL ~ an aromatic D amino acid } and a neutral D amino acid
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH