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<p>the body. In some cases the level or exposure-time may be critical, with some substances only becoming neurotoxic in certain doses or time periods. Some of the most common naturally occurring brain toxins that lead to neurotoxicity as a result of long term drug use are <a href="page.php?w=amyloid_beta">amyloid beta</a> (A?), <a href="page.php?w=glutamate">glutamate</a>, <a href="page.php?w=dopamine">dopamine</a>, and <a href="page.php?w=oxygen_radicals">oxygen radicals</a>. When present in high concentrations, they can lead to neurotoxicity and</p><p>
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