Histological image (IMAGE) Northwestern University Caption This images shows transplanted islets (darker purple) and the blood vessels (the red/dark pink areas are blood cells trapped within the blood vessels). Credit Northwestern University Usage Restrictions add credit 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.