Kidney Stem Cells (IMAGE) University of Southern California Caption Developing human nephron, the filtering unit of the kidney. Credit Image by Nils O. Lindstrom and Tracy Tran/McMahon Lab USC Stem Cell Usage Restrictions Please use credit as stated 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.