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Kraken
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"...Researchers found that skin color can be regulated by estrogen and progesterone, two of the main female sex hormones. Estrogen darkens the skin; progesterone lightens the skin. Although this much was known to a limited degree, the newresearch revealed two cellular receptors that appear to control this process in skin cells called melanocytes."
(E2 Estradiol; P4 Progesterone)
Study 1"...By studying human skin cells both in a petri dish and in a 3D-bioengineered patch of skin about the size of a postage stamp, Ridky's team discovered a different, unexpected set of receptors on melanocytes that do interact with the sex hormones. Specifically, they found a receptor called GPER that interacts with estrogen and triggers melanin production, and a receptor called PAQR7 that interacts with progesterone and decreases melanin production."
Study 2
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