He scampered across the lab to a fridge that held cold tools and bottles of mysterious serums, everything except what a normal person put in a fridge. [Please select]
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Serums and vaccines have also been prepared and sold as cures and preventives, but the work is still considered in the experimental stage. [Please select]
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The isolation of germs, the discovery of toxins and serums, the triumph over diseases that once wasted whole nations and brought about the fall of empires, the arrest of infant mortality, the marvels of vivisection and surgery--the list is endless. [Please select]
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