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(A–F) Effects of repeated EA treatments on pain behavior response to colorectal distention pressure at day 7, 10, 13, 16, 19, and 22 (mean ± SD, n = 6). The pain response scores on a 0-4 scale, normal behavior-0, slightly modified behavior-1, mild behavior-2, moderate behavior-3, severe behavior-4. The values with different letters differ significantly (P < 0.05). Kruskal–Wallis analysis followed by Mann–Whitney U-test.
