Fig. 1.

Effect of puerarin on the expression of P2X₃ receptors in PBMCs by immunohistochemistry. a I: healthy volunteers(control); II: NS-treated group on the first day; III: NS-treated group on the second day; IV: NS-treated group on the third day; V: PUE-treated group on the first day; VI: PUE-treated group on the second day; V II: PUE-treated on the third day. (Arrows indicate the immunostaining of PBMCs; scale bars, 20 μm). b **p < 0.01, compared with Healthy group(control); ^## p < 0.01, compared with NS-treated group in histogram