Diffusion across a cell membrane (IMAGE) University of Groningen Caption A combination of stopped-flow kinetic measurements with molecular dynamics simulations reveals molecular details of the permeation of small polar compounds (water and lactic acid) through model cell membranes. Credit J. Melcr / University of Groningen Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.