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Dose response curves demonstrate antigen-specific inhibition of IgG reactivity with the beta-1 adrenergic receptor by human cardiac myosin and B1 or B2 adrenergic receptors. Reactivity of purified IgG from cardiomyopathy sera is inhibited by human cardiac myosin, and B1 or B2 adrenergic receptors but not by the alpha 2 adrenergic receptor or BSA.
