Pig Liver Tissue (IMAGE) Johns Hopkins Medicine Caption These pig liver tissue samples show the expression of proteins AKT and Beta-catenin two months after researchers administered gene therapy to the animal via ERCP. A team of Johns Hopkins researchers published an article this summer on using the endoscopic technique to deliver engineered genes to the liver through the common bile duct. Credit Johns Hopkins Medicine 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.