{TAIL ~ Preferred MRT polypeptides} include, for example, at least one transmembrane binding domain which has at least about 40%, more preferably at least about 50%, 55%, 60%, 70%, 80% or 90% amino acid sequence identity with an amino acid sequence shown in SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, SEQ ID NO:8 or {HEAD ~ SEQ ID NO:14}, and at least one histidine rich domain 
{ TAIL ~ Preferred MRT polypeptides } include , for example , at least one transmembrane binding domain which has at least about 40 % , more preferably at least about 50 % , 55 % , 60 % , 70 % , 80 % or 90 % amino acid sequence identity with an amino acid sequence shown in SEQ ID NO:2 , SEQ ID NO:4 , SEQ ID NO:6 , SEQ ID NO:8 or { HEAD ~ SEQ ID NO:14 } , and at least one histidine rich domain
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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