Proton pump array (IMAGE) University of California - Santa Cruz Caption Proton pump arrays were fabricated on transparent substrates with integrated microfluidic channels to enable on-chip cell culture and monitoring of device performance and cell responses via fluorescence microscopy. Credit Jack Selberg Usage Restrictions For use only with news coverage of this research 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.