Primitive blood vessels. (IMAGE) University of Tokyo Caption This image shows the similarities between the transient blood vessels (pink), called aortic subepicardial vessels (ASVs), in the hearts of frogs and mice. As the mice grow into adulthood, these vessels disappear and coronary arteries form. In frogs, these vessels are maintained throughout their lives. Credit 2023, Mizukami et al. Usage Restrictions Credit must be given to the creator. No derivatives or adaptations of the work are permitted. License CC BY-ND 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.