No Melanocytes (IMAGE) Howard Hughes Medical Institute Caption A zebrafish larva lacking the protection of a pigmented cell umbrella leaves kidney stem cells (red) exposed to UV light. Right image is a closeup of the box. Scale bars equal 100 micrometers (left) and 50 micrometers (right). Credit F. Kapp et al./<i>Nature</i> 2018 Usage Restrictions Please use 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.