The U-shaped pattern (IMAGE) University of Groningen Caption This picture of a microscopic slide shows the U-shaped pattern (in green) visible in the skin biopsy of an epidermolysis bullosa acquisita patient. Credit UMCG/University of Groningen Usage Restrictions With credit 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.