Tetramethylpyrazine Improves Monocrotaline-Induced Pulmonary Hypertension through the ROS/iNOS/PKG-1 Axis

Figure 2

Transmission electron microscopic images. SMC = smooth muscle cell; CF = collagen fiber; EC = endothelial cell; EF = elastin fiber; L = lumen; SEL = subendothelial layer.