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Figure 4 Relation between the expression level of RyR mRNA (A) or Ca²⁺-ATPase mRNA (B) in the atrium of patients with atrial fibrillation (AF) and magnitude of pulmonary capillary wedge pressure (PCWP) (A-i, B-i), mean pulmonary arterial pressure (mPAP) (A-ii, B-ii), and right atrial pressure (RAP) (A-iii, B-iii). Data are mean ± SD.