Chemostats (IMAGE) PLOS Caption By applying systems-level biology to yeast cells growing in steady-state potassium limited chemostats, pictured above, the authors uncovered ammonium toxicity in yeast. Credit Image: M. Dunham Usage Restrictions Please cite M. Dunham and PLoS Biology as the source. 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.