Expression of PP2A protein in the spinal cord at 5, 15, 30, 60, and 90 minutes following vehicle or capsaicin injection in the periphery. (A) Immunoreactive bands of rat spinal cord tissue (L3–L6) against PP2A antibody at 5, 15, 30, 60, and 90 minutes after capsaicin or vehicle injection; the lower row shows the bands produced by the antibody to β-actin as a loading control at the same times. (B) Bar graph summarizing the relative density of the immunoblots of rat spinal cord tissue (L3–L6) with the PP2A antibody to that of β-actin at 5, 15, 30, 60, and 90 minutes after capsaicin or vehicle injection. Open bar: vehicle injection, filled bar: capsaicin injection. N = 6 in each group; the relative densities are expressed as mean ± SEM. *p < 0.05.