New Blood Vessel Network (IMAGE) Johns Hopkins Medicine Caption Shown are lab-grown human blood vessel networks (red) incorporating into and around mouse networks (green). Credit PNAS Usage Restrictions Contact PNAS for usage permission. 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.