3D Images of a Biliary Tree (VIDEO) University of Pittsburgh This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Unlike normal mice, animals lacking YAP1 gene don't form bile ducts. Credit Anastasia Gorelova/UPMC 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.