Word: knockoutã
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...strengthening connections between their nerve cells, raising questions about their ability to properly learn fear. To test this ability, researchers exposed mutant mice and the control group to a small shock immediately after hearing a loud noise. When hearing the same noise 24 hours later, the “knockout?? mice froze in place only about 60 percent as long as normal mice. Other tests were conducted to see if the mice had abnormal hearing or pain sensitivities, but this did not appear to be the case. When normal and mutant mice were placed in a new environment...
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