The MRT polypeptides of the invention are capable of transporting metals such as Fe, {HEAD ~ Cd}, {TAIL ~ Co}, Mn, Pb, Hg and Zn 
The MRT polypeptides of the invention are capable of transporting metals such as Fe , { HEAD ~ Cd } , { TAIL ~ Co } , Mn , Pb , Hg and Zn
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH