Gene Expression in a Sea Urchin Embryo (IMAGE) California Institute of Technology Caption This image of a sea-urchin embryo shows where two different regulatory genes are being expressed, labeled in fluorescent green and red. Credit Caltech/Isabelle Peter 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.