Blood clotting (IMAGE) University of California - Santa Cruz Caption Upon vascular injury, platelets in young mice form much smaller blood clots (left) than platelets in old mice (right), where the clot almost occludes the blood vessel. Fluorescence microscopy image from Poscablo et al, CELL, 2024. Credit Poscablo et al 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.