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Dose effect of serum immunoglobulin G (IgG) from 3 subjects with postural orthostatic tachycardia syndrome (POTS) on angiotensin II type 1 receptor (AT1R) activation in AT1R‐transfected Chinese hamster ovary cells. Values are expressed as percentage of buffer baseline. There was a significant dosage‐dependent increase in AT1R activation with a maximal effect at 0.5 mg/mL. n=3. *P<0.05, **P<0.01 vs baseline.
