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