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. 2002 Oct 18;545(Pt 3):1017–1026. doi: 10.1113/jphysiol.2002.023408

Figure 2. Activity of the C4 root and the L1 root in the brainstem-spinal cord preparation.

Figure 2

A, a control recording. B, a response to the μ opioid receptor agonist. Note that in the absence of C4 activity, the L1 activity is transformed into a single burst. A model for the mechanism of this transformation is shown in Fig. 6.