chick embryo gastrulation (IMAGE) University of California - San Diego Caption A snapshot of the development of twin chick embryos. The yellow streaks mark the future spinal cord. Credit Mattia Serra group / UC San Diego Usage Restrictions editorial use only License Original 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.