Search for: [Description = "The level of gamma\-globulins shows greater variability in young voles, Microtus arvalis \(Pallas, 1779\), as compared with middle\-aged individuals. A particularly large variability of this index was observed in breeding voles captured in early summer. The correlation between the population density and variability in the level of gamma\-globulins is significant for low\-density populations \(northern Poland\), being positive for sexually monactive voles, while negative for reproducing animals."]

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