PKA Subunits (IMAGE) University of California - San Diego Caption Elevating cAMP triggers PKA to form liquid droplets to buffer cAMP levels in human cells. Scale bar is 10 µm. Credit UC San Diego Health Sciences Usage Restrictions Use photo 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.