Tumour model (IMAGE) University of Göttingen Caption Tumour model using clumps of cancer cells (their nuclei are marked red) in a soft 3-D matrix of collagen. Pressure causes the cancer cells to burst rapidly into the surrounding soft matrix. Credit Dr Swetha Raghuraman Usage Restrictions None 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.