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Alterations in the levels of ferritin, E2 and testosterone in women and men over time. (A) Serum levels of E2 were converted to a percentage of the normal value in the serum of 25-year-old women (500 pg/ml). (B) Serum levels of testosterone were converted to a percentage of the normal value in the serum of 20-year-old men (4.4 ng/ml). Levels of ferritin are expressed as ng/ml serum. E2, 17β-estradiol; T, testosterone.
