Sentences with phrase «rats of various ages»
Comparing the performance of rats of various ages, the researchers found that the amount of satellite cells increased when rats ran on a treadmill for 20 minutes each day for 13 weeks.
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Over the past two years Skinner, of Washington State University, showed that as male descendants of these rats aged, they developed sperm deficiencies, infertility, and various other afflictions, from breast tumors to kidney disease.