Mouse skin cells (IMAGE) University of Bonn Caption with nucleus stained blue. Lysosomes were stained red, and a newly discovered lysosomal protein was stained green. Where both occur together, this results in a yellow coloration. Credit Image: Florian Bleibaum/University of Kiel Usage Restrictions This image may be used together with the press release. 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.