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Effect of fasting on the hypothalamo-pituitary-thyroid axis. PVN: paraventricular nucleus; ARC: arcuate nucleus; TRH: thyrotropin releasing hormone; TSH: Thyroid-stimulating hormone; T3: triiodothyronine; T4: thyroxine; POMC: Pro-opiomelanocortin; NPY: neuropeptide Y; AgRP: agouti-related protein.
