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The low incidence of multiple sclerosis in areas near the equator may be due to ultraviolet light induced suppressor cells to melanocyte antigens

Toxicology 406-407, 8191

For plasma preparation, EDTA and heparinized blood was centrifuged (1,950 x g, 15 min, Varifuge 3.0, Heraeus, Hanau, Germany) and the obtained plasma was stored at -80C until further analysis

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In Handbook of clinical neurology (Vol
