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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Rodents are the workhorses of biomedical labs.
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3 .So it's important to know if they're stressed out, which could affect results.
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4 .Now we know that lab rodents may be regularly exposed to a big stressor: men.
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5 .Researchers noticed that mice showed a lower pain response, a sign of stress, when a human was present.
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6 .So they put mice and rats into clear cubicles, where their faces were visible, and injected them with an irritant.
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7 .The rodents expressed pain through grimacing when no humans were nearby.
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8 .But when confronted with a male researcher, or even just his odoriferous T-shirt, the animals grimaced less.
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9 .Female observers did not get the same rodent reaction.
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10 .Turns out that smelling a human male made rodents produce higher levels of a stress hormone and increase their body temperature.
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11 .That stress response also blunted their sensitivity to pain.
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12 .The study is in the journal Nature Methods.
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13 .Researchers may have to come up with ways to ward off the stress effects of male researchers.
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14 .Because to a rodent, men smell like hell.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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