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