Model of Molecular Diffusion (image) Rockefeller University Press Caption In a recent JGP article, researchers developed a novel approach to study GPCR movement within a living cell. This image shows the grid used for modeling diffusion, with tracings from the image of a rod outer segment indicating disc perimeter (white) and incisures (orange). Credit Najafi, M., et al. 2012. J. Gen. Physiol. 140:249-266. Usage Restrictions Reporters may freely use these materials in news coverage, with the appropriate credit information. 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.