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<mml:mi mathvariant="normal">viability</mml:mi>
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<mml:mfenced close=")" open="("> <mml:mo>%</mml:mo>
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<mml:mo>=</mml:mo>
<mml:mi mathvariant="normal">Optical</mml:mi>
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<mml:mi mathvariant="normal">density</mml:mi>
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<mml:mfenced close=")" open="("> <mml:mi mathvariant="normal">OD</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">the</mml:mi>
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<mml:mi mathvariant="normal">treated</mml:mi>
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<mml:mi mathvariant="normal">cells</mml:mi>
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<mml:mtr> <mml:mtd> <mml:mspace width="6em"/>
<mml:mspace width="4.2em"/>
<mml:mo stretchy="true">/</mml:mo>
<mml:mi mathvariant="normal">OD</mml:mi>
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<mml:mi mathvariant="normal">of</mml:mi>
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<mml:mi mathvariant="normal">the</mml:mi>
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<mml:mi mathvariant="normal">non</mml:mi>
<mml:mo>&#8210;</mml:mo>
<mml:mi mathvariant="normal">treated</mml:mi>
<mml:mspace width="0.25em"/>
<mml:mi mathvariant="normal">cells</mml:mi>
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<mml:mo>&#215;</mml:mo>
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<mml:mn>100</mml:mn>
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