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