Branches in Lung Development (IMAGE) Princeton University, Engineering School Caption The delicate branching of developing lung tissue is controlled in part by mechanical forces, Princeton researchers have found in a series of experiments. Credit Nelson Lab, Princeton University Usage Restrictions non-commercial use 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.