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Figure 1 Immunostaining of angiotensin II (ANGII) receptors. Exemplary pictures of immunostaining of ANGII subtypes in human left atrial tissue. (A, B) Antibodies against human AT₁ (red-stained pixels) in sinus rhythm (SR) (A) and lone chronic atrial fibrillation (CAF) (B) were used for immunostaining in paraffin-embedded tissue sections. (C, D) Antibodies against human AT₂ (red-stained pixels) were used for immunostaining of paraffin-embedded tissue sections of patients with SR (C) and lone CAF (D).