Collagen in Tissue Samples (IMAGE) University of Washington Caption These images show differences in collagen build-up in two tissue samples. Collagen is labeled in blue. The left image shows a thick collagen wall forming in the presence of a material that's widely used for implantable devices. In contrast, collagen in the right image is more evenly dispersed in the tissue after the UW-engineered hydrogel has been implanted. Credit Lei Zhang, Univ. of Wash. Usage Restrictions Photo credit required 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.