Compared to NFH, in FH we observed a significant reduction in almost all proteins responsible for iron transportation into the cell: DMT-1 (ng/mg; NFH 5.8 ± 1.1 vs. FH 4.3 ± 0.6; p < 0.0001); L-CH (ng/mg; NFH 67.3 ± 23.2 vs. FH 47.3 ± 8. This evidence concerns the gene C4B and familial hyperaldosteronism.