{TAIL ~ The invention} also provides an isolated or purified preparation of {HEAD ~ an MRT} polypeptide 
{ TAIL ~ The invention } also provides an isolated or purified preparation of { HEAD ~ an MRT } polypeptide
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH