Mouse kidney nephron progenitor cells (IMAGE) Keck School of Medicine of USC Caption Mouse kidney nephron progenitor cells (purple) forming the developing nephron tubules (yellow) of the kidney’s filtering units, the nephrons. (Image by Helena Bugacov/McMahon Lab) Credit Helena Bugacov/McMahon Lab Usage Restrictions None License Original 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.