TPC1 Ion Channel (IMAGE) University of Würzburg Caption The activity of the TPC1 ion channel in the vacuole membrane (yellow) is essential for the excitability of the vacuole. On the left is a plant cell, in the middle the vacuole with chloroplasts (red) and a 3D reconstruction of the TPC1 crystal structure. Credit Dawid Jaslan / University of Würzburg 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.