Restoring Fertility (IMAGE) University of Pennsylvania School of Medicine Caption Transplanting testicular endothelial cells (but not lung endothelial cells) into the testes of mice after destruction of sperm due to treatment with the chemotherapy drug busulfan restores developing sperm. Credit Dong-Ha Bhang, Penn Medicine: <i>Nature Communications</i> 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.