Additional file 4.
Acute treatment with caffeine (10 mg/kg) did not cause a significant change in the respiratory rate. The respiratory rate was counted for 1 min. The count was based on the up-and-down movement of the abdomen associated with the animal's breathing. Caffeine was injected intravenously. Values are expressed as the percentage of the control (n = 8).
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Han et al. BMC Neuroscience 2009 10:110 doi:10.1186/1471-2202-10-110