Illustration of Pathway (IMAGE) Imperial College London Caption Calcium enters the artificial cells through a pore, which activates enzymes that cause the vesicles to release fluorescent particles through a protein channel. Credit Zehua Hu / Imperial College London Usage Restrictions None 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.