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This works by temporarily blocking nerve signals to the muscles which will prevent the facial muscles from contracting when making expressions

Shaw K, Bell L, Boyd K, Grijseels D, Clarke D, Bonnar O, Crombag H, Hall C (2021) Neurovascular coupling and oxygenation are decreased in hippocampus compared to neocortex because of microvascular differences

Chin Med J (Engl)

(2) Researchers find that naturally occurring peptides may occasionally exhibit instability and easy degradation by biological enzymes, such as those found in gastrointestinal and cerebrospinal fluids

Do not assume anything

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