Single HEK cell (IMAGE) DOE/Brookhaven National Laboratory Caption These superimposed tomography images show the nucleus (red) and cytosol (gray) with correlative X-ray fluorescence images of calcium distribution (green) in a human embryonic kidney cell. Credit Brookhaven National Laboratory/Nature Communications Biology Usage Restrictions For use with this article and related content. 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.