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Quadratic regression of pre-donation storage iron (mg/kg) against pre-donation ferritin (ng/mL) for 193 subjects enrolled in the HEIRS study. Storage iron was determined from ferritin and sTfR as described in Methods. The male regression is indicated by a solid line and female regression by a dashed line. The HEIRS randomization assignment of the individual donors (see Methods) is shown by the symbols indicated in the Figure.
