Preparation of Tissue Sample (image) Linköping University Share Print E-Mail Caption The researchers have investigated human colon biopsies in Ussing chambers. Credit Karin Söderlund Leifler/LiU Usage Restrictions Please use proper caption and credit. Share Print E-Mail 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.