Mouse Livers (IMAGE) University of California - San Diego Caption Left to right: 1) healthy mouse liver, 2) liver deficient for Shp2, 3) liver deficient for Pten, 4) liver deficient for both Shp2 and Pten. Tumors are visible in 3) and are even more prominent in 4), where both enzymes are lacking. Credit Gen-Sheng Feng, UC San Diego Health Usage Restrictions Use photo credit as indicated 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.