Blood Vessels (IMAGE) Goethe University Frankfurt Caption This is an image of blood vessels in the heart (shown in red). The large vessel is surrounded by smaller vessels (capillaries). The nuclei are shown in blue, and the neurons are green. Credit Dimmeler 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.