ePetri (IMAGE) California Institute of Technology Caption The ePetri platform is built from Lego blocks and uses a smartphone as a light source. The imaging chip is seen in detail on the right. Credit Image courtesy of Guoan Zheng, California Institute of Technology Usage Restrictions Appropriate caption and credit required 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.