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Angiogenesis is the nature and pathological process of blood vessel growth from pre-existing vascular buds. It plays an important role in cancer and cardiovascular disease. The aorta ring assay is an approach to study angiogenesis. In this experiment, we used the aorta of rat as the study material, cleaned the surrounding tissue of aorta and cut it into 1 mm long rings. Next, the rings were cultured in growth factor-reduced matrigel polymerized at 37 °C. Angiogenesis was assessed at 7 days by using an inverted microscope platform.