(IMAGE) Kumamoto University Caption Concept of the endothelial-activated Bivalent switch (bottom row); unlike existing stem cell differentiation switches (top row), the gas pedal for Pol II running on the gene is applied with the brake on, resulting in transient transcription. Credit Dr. Takashi Minami Usage Restrictions Credit must be given to the creator. License CC BY 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.