KCNN3 and migraine disorder: This study examined CAG repeat lengths (the second, C-terminal, polyglutamine array in exon 1 of KCNN3) in migraine patients and also found no significant evidence to suggest long CAG repeats (>19) are over-represented in patients with migraine compared to controls, even though there was a higher incidence reported for long CAG repeat (>19 repeats) in the migraine group compared to the controls (Table I), it did not reach statistical significance (P < 0.05).