TLR4 and fibromyalgia: In addition, the increased TLR4 and MyD88 concentrations in the SSCs of the fibromyalgia mice (Figure 5F,G, Tukey’s test, * p < 0.05, n = 6) were inhibited by 2 Hz EA or PD-L1 injection (Figure 5F,G, Tukey’s test, # p < 0.05, n = 6).