Packaging Tetrodotoxin (IMAGE) Boston Children's Hospital Caption Injected alone, the polymer-bound tetrodotoxin was released, but did not readily enter the sciatic nerve until the chemical permeation enhancer was added (at bottom). Credit [modified from Zhao et al / Boston Children's Hospital with Xiaosi Li] Usage Restrictions please credit as indicated 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.