Figure 1
From: FMR1 CGG allele size and prevalence ascertained through newborn screening in the United States
CGG repeat allele size distribution. Histograms display the CGG repeat length observed in the newborn screening by allele category. A) FMR1 alleles in the normal range (<45 CGG repeats, n = 20710 alleles). B) FMR1 alleles in the gray zone range (45-54 CGG repeats, n = 170 alleles). C) FMR1 alleles in the expanded gray zone range (40-54 CGG repeats, n = 614 alleles). D) FMR1 alleles in the premutation range (55-200 CGG repeats, n = 50).