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(a) Relationship between the number of GRK4 polymorphic alleles GRK4 (R65L, A142V, A486V—LL, VV, VV = 6 alleles) and NT-proBNP concentration. Number of subjects is indicated in each bar. Subjects with incomplete GRK4 genotyping were not included in the analysis. *P < 0.05 versus GRK4 SNP-free subjects. (b) The relationship between systolic blood pressure (Systolic BP) and NT-proBNP concentration.
