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Determination of melatonin concentration in serum of ground squirrels by ELISA. SA: summer active, LT: late torpor, IBA: interbout arousal. n = 6. Data are mean ± SD. Statistically significant differences are denoted as follows: *** p < 0.001, as compared with the SA group, and ## p < 0.01, as compared with the LT group.
