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