Breast cancer tumour basement membrane (IMAGE) University of Turku Caption Early-stage breast cancer tumours are separated from their environment by a basement membrane that acts as a biological barrier. In the picture, localised cancer tumours (nuclei blue and cells partly red) are surrounded by the basement membrane (green). Credit Guillaume Jacquemet, Åbo Akademi Usage Restrictions Please attribute to Guillaume Jacquemet, Åbo Akademi 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.