Substance (IMAGE) Neural Regeneration Research Caption This shows substance P-positive products in rats with sciatic nerve injury at 7 days (immunohistochemical staining, × 400). Credit <i>Neural Regeneration Research</i> Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.