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Five-day (96-h) profile of circulating thyrotropin (TSH), expressed as the percentage relative to baseline, following a challenge with 100 µg 3,5,3′-triiodothyronine (T3, oral administration) in members of long-lived families, offspring (n = 14), and similarly aged controls (n = 13), as measured across 29 time points. Dashed lines: offspring, solid lines: controls. Error bars: SEM.
