Clock Protein (IMAGE) University of California - San Diego Caption This mustard seedling is stained blue wherever the newly discovered clock protein CHE occurs. Credit Jose Pruneda-Paz Usage Restrictions For use with stories about this research project. 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.