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Association of GPCR‐Abs and nt‐proBNP; GPCR‐Abs were normalized to total IgG and logarithmized. Red: Heart failure group. Blue: Control group. C, control; HF, heart failure; IgG, immunoglobulin G. Data given as Spearman rho. (A) α1‐adrenergic antibodies. (B) β1‐Adrenergic receptor antibodies, measured via cyclic peptide assay. (C) Muscarinic receptor M5 antibodies. (D) Angiotensin II receptor type 1 antibodies. (E) Angiotensin II receptor type 2 antibodies. n = 91 vs. n = 60.
