ANN ARBOR, Mich. --- Low nutritional zinc has been linked to diabetes and other diseases. Nanoscale computer simulations of how zinc travels may help explain its role in disease. Here carbonic anhydrase (CA) proteins are binding free zinc ions in a red blood cell. CA molecules bound to zinc are encased by transparent green spheres representing fluorescence, while apo-CA molecules are in blue. The simulation was done by the research groups of Profs. Ann Marie Sastry and Christian Lastoskie at the University of Michigan.