BLT Humanized Mouse (IMAGE) University of North Carolina Health Care Caption The humanized "BLT" mouse is created by introducing human bone marrow, liver and thymus tissues into animals without an immune system of their own. The BLT mouse has a fully functioning human immune system. Credit University of North Carolina School of Medicine Usage Restrictions May use with proper credit. 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.