{HEAD ~ The invention} further provides isolated MRT polypeptides, fusion polypeptides and {TAIL ~ active fragments} thereof 
provides
{ HEAD ~ The invention } further provides isolated MRT polypeptides , fusion polypeptides and { TAIL ~ active fragments } thereof
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH