CD8A and incontinentia pigmenti: In contrast, a strong and significant increase of the frequency of CD3+CD8+GrzB+ T cells was found in the IP group when compared to all three other groups (HD = 36.48% ± 14.4; AS = 33.79% ± 10.90; OP = 44.47% ± 23.25; IP = 61.58 % ± 20.35).