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