Fig. 6

Neurons showing positive immunoreactivity for the glutamate-binding NR2 subunit (NR2B) of the N-methyl-D-aspartate (NMDA) receptor in transverse sections of the spinal dorsal horn and central canal region at the thoracolumbar (T13-L2) segmental level (magnification ×100). a Low expression of NR2B in the spinal dorsal horn of the control rat; b high expression of NR2B in the spinal dorsal horn of the model rat (without any treatment); c low expression of NR2B in the spinal dorsal horn of the EA-treated model rat; d high expression of NR2B in the spinal dorsal horn of the sham EA-treated model rat; e low expression of NR2B in the central canal region of the control rat; f high expression of NR2B in the central canal region of the model rat (without any treatment); g low expression of NR2B in the central canal region of the EA-treated model rat; h high expression of NR2B in the central canal region of the sham EA-treated model rat. Scale bar 100 μm