In preferred embodiments, an MRT polypeptide comprises an amino acid sequence of SEQ ID NO:2, {HEAD ~ SEQ ID NO:4}, SEQ ID NO:6, SEQ ID NO:8 or {TAIL ~ SEQID} NO:14 
In preferred embodiments , an MRT polypeptide comprises an amino acid sequence of SEQ ID NO:2 , { HEAD ~ SEQ ID NO:4 } , SEQ ID NO:6 , SEQ ID NO:8 or { TAIL ~ SEQID } NO:14
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH