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<p>on the <a href="page.php?w=standard_person">standard person</a> concept, a theoretical individual that has perfectly "normal" characteristics, and thus not apply to all sub-populations.</p>

<p><big><span id="LD50"></span>Median lethal dose (LD<sub>50</sub>)</big></p>
<p>The median lethal dose, LD<sub>50</sub> (abbreviation for "lethal dose, 50%"), LC<sub>50</sub> (lethal concentration, 50%) or LCt<sub>50</sub> (lethal concentration and time) of a <a href="page.php?w=toxin">toxin</a>, <a href="page.php?w=radiation">radiation</a>, or <a href="page.php?w=pathogen">pathogen</a></p><p>
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