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Diagrams displaying the mean heart rate (HR mean) and standard error of the mean (SE) of the 9 rats. There is a significant decrease of HR mean during (b) and after (c) violet laser stimulation at Baihui compared to the reference interval before stimulation (a). The different measurement phases (a–c; compare with Figure 2) and acupuncture points (Baihui; ear acupuncture: heart point; Zusanli) are indicated.
