L4 Nerve Root Avulsion (IMAGE) Neural Regeneration Research Caption Five weeks after L4 nerve root avulsion with preconditioning crush 1 week prior to avulsion, the expression of 27 kDa heat shock protein is stronger than that in the avulsion-only group. 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.