Dennis M. McNamara et al. JCHF 2014;2:551-557 GNB3 Genotype Frequencies in GRAHF (A-HeFT) and the Black and White Subsets From GRACE Frequency of the GNB3 T haplotype is significantly greater in GRAHF (p < 0.001) compared with the white subset from GRACE. A-HeFT = African American Heart Failure Trial; GNB3 = guanine nucleotide-binding proteins (G-proteins) beta-3 subunit; GRACE = Genetic Risk Assessment of Cardiac Events; GRAHF = Genetic Risk Assessment of Heart Failure in African Americans. Dennis M. McNamara et al. JCHF 2014;2:551-557 American College of Cardiology Foundation