Embryogenesis Reveals the Role of the 'Second Brain' in Digestion (image) CNRS Share Print E-Mail Caption Contractions through the embryonic gut. Credit Nicolas Chevalier et al. Usage Restrictions None Share Print E-Mail 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.