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Figure 2 Correlation between the mean protein expression of Kv4.3 (triangle, r = 0.67, p > 0.05), Kv1.5 (circle, r = 0.97, p = 0.02) and Kir3.1 (square, r = 0.56, p > 0.05) in patients with paroxysmal atrial fibrillation and the duration of sinus rhythm before surgery.