In {TAIL ~ certain embodiments}, {HEAD ~ X3} is selected from D arginine, D lysine and D histidine 
In { TAIL ~ certain embodiments } , { HEAD ~ X3 } is selected from D arginine , D lysine and D histidine
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH