In {TAIL ~ certain embodiments}, {HEAD ~ X6} is selected from D arginine, D tryptophan, D tyrosine, D proline and D valine 
In
In { TAIL ~ certain embodiments } , { HEAD ~ X6 } is selected from D arginine , D tryptophan , D tyrosine , D proline and D valine
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH