GFAP and fibromyalgia: Iba1 and GFAP expression was observed in the SSCs of the normal mice; the levels of these proteins were increased in the fibromyalgia mice (Figure 5A,B, Tukey’s test, * p < 0.05, n = 6), but the 2 Hz EA treatment significantly attenuated this effect (Figure 5A,B, Tukey’s test, # p < 0.05, n = 6), and a similar tendency was observed with PD-L1 injection (Figure 5A,B, Tukey’s test, #p < 0.05, n = 6).