Figure 2. Instability of expanded CAG repeats upon transmissions (dashed line corresponds to stability of the CAG repeat transmission). (a) Delta-expanded-(CAG)n child-parent according to parental CAG repeat length; (b) Delta-expanded-(CAG)n child-parent according to parental age at child-birth; (c) Delta-expanded-(CAG)n between siblings according to their age differences and gender of affected parent. Full circles: paternal transmissions; empty circles: maternal transmissions.