Immunofluorescence Image of Nanoparticles (image) University of Freiburg Caption Immunofluorescence image shows nanoparticles targeted to endothelial cells. The red particles turn orange when overlapping with the green caveolin in the lipid rafts of the cells. Credit Julia Voigt/ Prasad Shastri Usage Restrictions Usage only with Credit 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.