Second messengers (IMAGE) Nagoya University Caption Optical images of cAMP (left) and calcium (right) in the suprachiasmatic nucleus Credit Daisuke Ono Usage Restrictions This image may be used with appropriate credit. 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.