Fig. 5

Diagram of the experimental system. a Illustration of the whole system. Mediators from the acupoints are pumped into the chamber through the microdialysis tube. Cells expressing different receptors are used to record the currents. b A microdialysis tube was implanted into the rat’s Zusanli acupoint (ST 36). c The cell was patch-clamped by the pipette. Shadow on the left was the tube through which the perfusate was pumped into the chamber