The Relative Timing of Transcription Factor Pulses Affects Gene Expression (image) California Institute of Technology Share Print E-Mail Caption A static picture of budding yeast cells expressing fluorescent protein fused Msn2 (green) and Mig1 (red) is shown. Each individual spot of green or red signal represents nuclear localization of the corresponding protein. Yellow color represents co-localization of the two proteins. Credit Michael Elowitz and Yihan Lin/Caltech Usage Restrictions None Share Print E-Mail 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.