x1 = FeDuo
x2 = FeRBC
x3 = FeSpleen
x4 = FeLiver
x5 = Tf
x6 = Hepcidin
x7 = Fe2Tf
x8 = Fe1Tf
x9 = NTBI
x10 = FeRest
x11 = FeOutside
x12 = FeBM