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The first caliphate to begin expansion outside of Arabia was:
Leptin
is a hormone produced by fat cells that regulates food intake and energy expenditure by signaling satiety to the brain.
Growth Factors
Natural substances capable of stimulating cellular growth, proliferation, healing, and cellular differentiation.
Melatonin
A hormone produced by the pineal gland that regulates sleep cycles.
Pineal Gland
Gland—either at the skin surface (fish, amphibians) or in the third ventricle of the brain (mammals)—that produces melatonin.
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