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After long-term exposure (up to 32 weeks, starting at the age of 2 months) to iodide (NaI 0.05%) in drinking water, serum T4 levels decrease in (A) BALB/c mice but are unchanged in (B) NOD.H2h4 mice. The numbers of mice studied are in parentheses. Statistically significant differences: panel A males, *P = 0.011, ^P = 0.035; females, #P < 0.001, **P = 0.005 (t tests).
