In certain embodiments, {HEAD ~ X4} is selected from D proline, D arginine and {TAIL ~ D} phenylalanine 
is selected from
In certain embodiments , { HEAD ~ X4 } is selected from D proline , D arginine and { TAIL ~ D } phenylalanine
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH