Collagen IV (image) Brigham and Women's Hospital Caption Collagen IV-targeted polymeric nanoparticles (shown in pink) are home to injured tissue, post-injection, in the blood. Credit Farokhzad Lab Usage Restrictions Please only use with associated press release. 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.