Szukana fraza: [Opis = "Studies were made of the body and skeleton growth of field voles, Microtus agrestis \(Linnaeus, 1761\), born in spring \(n=66\) and in autumn \(n=33\) in a laboratory colony. All the voles were weighed weekly. Each month 5 spring and 4 autumn voles were taken at random, injected with tetracycline hydrochloride \(TH\) in doses of 20mg\/kg of body weight, and killed 15 days later."]

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