pAECs were collected from WT pigs and from two different genetically-modified pigs provided by the National Swine Resource and Research Center (NSRRC, Columbia, MO), namely GTKO and GTKO/hCD55 pigs. pAECs were isolated from fresh aortas and cultured, as previously described14 (link). Human aortic endothelial cells (hAECs) were purchased from Lonza (Walkersville, MD), and cultured as previously described14 (link).