FoxO1 (IMAGE) Max-Planck-Gesellschaft Caption FoxO1 halts unrestrained cell division in pulmonary arteries. The images show photomicrographs of pulmonary arteries of rats with pulmonary hypertension. Whereas the blood vessel of an untreated rat is drastically reduced in diameter (left image), the vessel wall is essentially normalized after activation of FoxO1 (right). Credit MPI for Heart and Lung Research Usage Restrictions None 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.