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Figure 3 EM of groups 3 and 4. A, Scanning EM of a nonblue area showing normal endothelium. B, Endothelial cell retraction at 2 weeks after stenting as illustrated by scanning EM, shows fingerlike projections between adjacent endothelial cells (arrowhead). Some have broken during critical point drying (asterisk). C, Transmission EM at 2 weeks after stenting shows loose junctions (arrow) between adjacent endothelial cells. D, At 12 weeks after stenting, transmission EM shows tight junctions (arrow). E, The permeable areas in the endothelium at 12 weeks after stenting are characterized by surface folds as observed with transmission EM (arrow). N = nucleus.