En face preparation and immunostaining were performed on the thoracic aorta as described in methods. A, B, thoracic aortas from Mef2cTie2EKO and control Mef2cWT mice were immunostained for PECAM-1, F-actin (phalloidin), and nuclei (DAPI). B, Mef2cCdh5EKO (14-days post tamoxifen) and vehicle control were immunostained for VE-Cadherin, F-actin (phalloidin) and nuclei (DAPI); C, thoracic aortas from Mef2cTie2EKO and Mef2cWT control were immunostained for VE-Cadherin, p-MLC, and F-actin (phalloidin). Representative confocal images are shown (n=4).