Lamin A vs. Lamin B (IMAGE) University of Pennsylvania Caption The nuclear envelope around DNA has a lamin mesh that is less phosphorylated and more stable under high stress, regulating gene expression. Credit Joe Swift and Irena Ivanovska, University of Pennsylvania 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.