Image of the gold nanoclusters in their (IMAGE) University of Leeds Caption The gold nanocluster in their 'molecular envelope'. The ligands in blue are the zwitterionic ones while those in red are positively charged ones. They are bound to the Au25 cluster (in brown) via thiol molecules (yellow). Credit University of Leeds Usage Restrictions Please credit image 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.