Circadian Clock in Cyanobacteria (IMAGE) University of California - San Diego Caption Real-time fluorescence measurements revealed that upon receiving the same resetting signal (indicated by gray bar), the In Vitro Clock system using only the CikA kinase shows a large response, while a SasA-only clock shows a small response. The clock system containing both kinases has a balanced response to the resetting signal, which is crucial for the cyanobacterium to properly align its internal clock with the environmental cycle. Credit Golden Lab, UC San Diego Usage Restrictions Must be used in conjunction with PNAS circadian clock paper. 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.