AGT and abdominal aortic aneurysm: As shown in Figure 8B, these co-cited references were divided into 9 clusters: Abdominal aortic aneurysms (cluster #0), regulatory T cell (cluster #1), angiotensin ii (cluster #2), perfusion-induced abdominal aortic aneurysms (cluster #3), matrix metalloproteinases (cluster #4), elevated plasma level (cluster #5), targeted gene disruption (cluster #6), e-deficient mice (cluster #7), chemokine-like function (cluster #8).