Scaffold Snare (IMAGE) DOE/Pacific Northwest National Laboratory Caption Large charged molecules (red) lure in calcium ions (blue), which position carbonate (yellow and red) and form ACC (white ball). Credit PNNL Usage Restrictions Please credit PNNL 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.