Photosystem II Lead Art (IMAGE) DOE/SLAC National Accelerator Laboratory Caption Using SLAC’s X-ray laser, researchers have finally seen the process by which nature creates the oxygen we breathe. Credit Greg Stewart/SLAC National Accelerator Laboratory Usage Restrictions No restrictions. License Public Domain 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.