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Figure 4 Representative Northern blots showing collagen type I, type III and atrial natriuretic peptide (ANP) in the excised left atrial appendages in patients with persistent atrial fibrillation after the maze procedure (AF group) and patients with sinus rhythm (SR group). Bar graph shows the summary of findings of Northern blot analysis of atrial collagen type I, type III and ANP messenger RNA in the AF and SR groups.
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