Fig. 1

Allele frequencies of HD (n = 86), carrier (n = 34) and control groups (n = 62). As indicated, the majority of the pathological alleles fall between 36 and 50 repeats, and those longer than 55 are very rare. Regarding the non-pathological range, the most frequent alleles are between 15 and 25 repeats, while intermediate alleles, especially those between 30 and 35 are also rare