Effect of electroacupuncture on the serum expression levels of (A) OPG and (B) RANKL in the femurs, as assessed by ELISA. (C) Ratio of OPG/RANKL expression in the femurs. Data are presented as the mean ± standard deviation (n=10). *P<0.01, vs. sham group; #P<0.01, vs. OVX group. OPG, osteoprotegerin; RANKL, receptor activator of nuclear factor-κB ligand; OVX, ovariectomized; GV, governor vessel; BL, bladder meridian.