Figure 1. Distribution in Iran of primary congenital glaucoma patients who do not carry CYP1B1 mutations. The number of chromosomes of primary congenital glaucoma (PCG) patients recruited from a given area of Iran that were observed not to carry CYP1B1 mutations is shown as the numerator of each fraction, and the total number of chromosomes screened in the areas is shown as the denominator. Fractions not enclosed in boxes relate to an earlier screening effort [9], and fractions enclosed in boxes refer to the more recent recruitment, which focused on northwestern, central, and eastern Iran.