Frequency-dependent ERK phosphorylation in spinal neurons by electric stimulation of the sciatic nerve and the role in electrophysiological activity oleh Wang Shenglan, Kobayashi Kimiko, Obata Koichi, Yamanaka Hiroki, Kamo Hiroshi, Iwata Koichi, Dai Yi, Fukui Tomokazu, Cui Xiuyu, Yoshiya Shinichi, Noguchi Koichi