Figure 1.

Levels of circulating β₁AR-Aabs and M₅R-Aabs of patients (before therapy) and controls. Left and Right: Serum levels of β₁AR-Aabs and M₅R-Aabs were measured by IgG-binding to the respective native receptors (CellTrend GmbH). Middle: β₁AR-Aabs were determined by IgG-binding to a cyclic peptide providing a valid representation of the presumed pathogenic conformational auto-epitope within the second extracellular loop of the receptor associated with the active receptor conformation (indicated CP). ***: differences at p < 0.001 significance.