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Enhanced plasma soluble suppression of tumorigenicity 2 (sST2) was found in persistent atrial fibrillation (AF) patients. Plasma levels of sST2 were measured by enzyme-linked immunosorbant assay (ELISA) kit and presented by dot plots. PaAF, paroxysmal AF; PeAF, persistent AF. *P < 0.01 vs. PeAF.
