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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Nat Rev Endocrinol. 2014 May 27;10(8):466–475. doi: 10.1038/nrendo.2014.78

Figure 1.

Figure 1

Time-of-day at which circulating levels of key endocrine factors peak in humans. Abbreviations utilized include: GH, growth hormone; TSH, thyroid stimulating hormone; PRL, prolactin; T3, triiodothyronine; RAAS, renin-angiotensin-aldosterone system; FGF21, fibroblast growth factor 21; (F), females only; (M), males only.