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Mercy Killing: How Should Lab Animals Be Put to Death?

Some researchers are concerned that current methods are not the least painful and least stressful options. 
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What’s the most humane way to kill lab animals? Some researchers are concerned that current methods are not the least painful and least stressful options. The most widely used method of killing rats, for instance, is with CO2, a method that studies suggest is stressful to rodents. 

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