Non-transferrin-bound iron (NTBI) uptake by T lymphocytes: evidence for the selective acquisition of oligomeric ferric citrate species. by Arezes, J, Costa, M, Vieira, I, Dias, V, Kong, XL, Fernandes, R, Vos, M, Carlsson, A, Rikers, Y, Porto, G, Rangel, M, Hider, RC, Pinto, JP