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2013;8(1):e54431

The main cellular sources of ROS are (1) mitochondria, where electron-transport-chain (ETC) leads ROS production through leakage of electrons during oxidative phosphorylation, (2) NADPH oxidases (NOXes), which generate superoxide and hydrogen peroxide (H 2 O 2 ) through transferring electrons from NADPH donors to oxygen, regulating both immune response and homeostatic ROS signalling (3) peroxisomes, which produce H 2 O 2 as a byproduct during breakdown of metabolic reactions such as breakdown of fatty acids and (4) xanthine oxidase, which generates superoxide and H 2 O 2 as a byproduct of oxidative hydroxylation of hypoxanthine in purine metabolism

The acceleration of cell turnover caused by tretinoin pushes impurities to the surface more rapidly, resulting in a temporary increase in acne, whiteheads, and blackheads lasting anywhere from 4-6 weeks

Our study demonstrated that cysteine (cystine) is an indispensable amino acid for mTORC1 signaling and the ISR in HepG2 cells

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