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Fig. 1. Changes in monoamine and adenosine levels in the brain of hibernating snail H. lucorum. Values are means ± S.E.M., N=10 determinations on separate preparations from different animals. Asterisks indicate values that are significantly different from the control values. 5-HT, serotonin; DA, dopamine; 5-HIAA, 5-hydroxyindole-3-acetic acetic, HVA: homovanillic acid.