Yeast Communication Graphic (IMAGE) University of Washington Caption On the left, a transcription factor designed by UW researchers (gray and red) is integrated into the "receiver" yeast cell. This activates a gene that turns the receiver cell fluorescent green. On the right, a "sender" yeast cell produces a plant hormone called auxin (orange dots). In the receiver cell, auxin recruits another protein (blue) to disable the transcription factor and turn off the gene that turned the receiver cell green. Credit University of Washington Usage Restrictions With credit 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.