Phase Separation in Membrane of Living Yeast Cell (image) University of Washington Share Print E-Mail Caption A vacuole from a genetically engineered strain of yeast in which membrane proteins fluorescently glow. Keller and her team have shown that the dark-spotted regions within the membrane form through phase separation, also known as demixing. Credit Alex Merz/University of Washington Usage Restrictions Must include credit 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.