Self-Organizing Blood Supply System (IMAGE) University of Pittsburgh Caption The more mature the designer liver organoids got, the more capillaries (red) snaked their way through the thin sheet of tissue (black). Credit Velazquez et al. (2020), Cell Systems. 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.