In other embodiments, {TAIL ~ X5} is selected from a neutral D amino acid and {HEAD ~ a positively charged D amino acid} 
In other embodiments , { TAIL ~ X5 } is selected from a neutral D amino acid and { HEAD ~ a positively charged D amino acid }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD