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Figure 2 Exemplary Western blots for human AT₁ (A) and AT₂ (B) expression in atrial fibrillation (AF). (A) A specific band at 52 kDa for AT₁ is detected in left atrial tissue of patients in sinus rhythm (SR), lone chronic atrial fibrillation (CAF), and patients with CAF and underlying mitral valve disease (MVD). (B) Western blots for AT₂ with a specific band at 52 kDa were performed for patients with SR, lone CAF, and MVD + CAF. Monoclonal antibodies for human glyceralaldehyde-3-phosphate dehydrogenase (GAPDH) with a specific band at 36 kDA were used as reference.