Oscillation Signal (IMAGE) Washington University in St. Louis Caption A global control signal is capable of selectively steering the complex chemical reaction into chosen spatial patterns, in this example, between shapes of letters 'O' and 'K' (in blue). Credit Washington University in St. Louis 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.