Figure 1.

Ideogram of the distribution of all detected CGG short tandem repeats throughout the human genome. Red bars above the chromosome represent the position and size of polymorphic CGG STRs (n = 5683) while the blue bars below represent the stable CGG STRs (n = 418). Median repeat length is indicated by the bar length and length range is indicated on the Y-axis accompanying each chromosome. Green regions on the chromosomes indicate the cytogenic positions where cytogenetically visible folate-sensitive fragile sites have been previously recorded, with the green text indicating the identity of each fragile site. Green markers on repeat bars indicate CGG STRs which have been previously identified as the causative repeats of the associated fragile site⁷. The y-axis bar length equals 32 on all chromosomes.