FIG. 3.

FMR1 array length instability in the rad27 mutant background. FMR1 array lengths for rad27 mutant strains carrying a 10A9A9(−) array showing contraction of 10 repeats in track 8 and an expansion of +10 repeats in track 10 (a) and a 9A48(−) array showing array expansions in tracks 2, 3, 4, and 9, a mosaic strain with an expansion which arose during colony growth (track 5), and array contractions in tracks 1, 6, 7, and 8 (b). In each panel, the position of the expected array length (as in Fig. 2) is indicated.