Embryonic Chick Gut (IMAGE) Harvard University Caption This is an embryonic chick gut at stage E16. Within a species, individuals of a given age will show the same number and size of gut loops. Credit Photo courtesy of L. Mahadevan. 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.