{HEAD ~ Preferred MRT polypeptides} are capable of, for example, transporting metals, e.g., Fe, e.g., Fe, Cd, Co, Mn, Pb, Hg and {TAIL ~ Zn} 
are capable of transporting
{ HEAD ~ Preferred MRT polypeptides } are capable of , for example , transporting metals , e.g. , Fe , e.g. , Fe , Cd , Co , Mn , Pb , Hg and { TAIL ~ Zn }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL