text: The Gly49 allele in the beta1-adrenergic receptor and the 5' LC-Cys19, Arg16, and Gln27 alleles in the @GENE$-adrenergic receptor were associated with a lower risk of @DISEASE$ in idiopathic dilated cardiomyopathy, suggesting that the beta1- and beta2-adrenergic receptor genes are modifier genes.