Normal Basement Membrane in Mouse Mammary Epithelium (image) University of California - San Francisco Share Print E-Mail Caption This electron microscope image shows normal basement membrane in mouse mammary epithelium on the right. On the left side the membrane is degraded, and one cell (white arrow) can be seen bulging out. Credit UCSF Usage Restrictions UCSF 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.