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. 1998 Mar 3;95(5):2541–2546. doi: 10.1073/pnas.95.5.2541

Figure 1.

Figure 1

Frequently sampled (every 7 min), 24-h profiles of plasma leptin, LH, and estradiol concentrations in six healthy women. Note in all subjects a nocturnal rise in plasma leptin concentrations and a change in LH pulse patterns from high frequency–low amplitude during the day to low frequency–high amplitude at night.