IFNA2 and incontinentia pigmenti: Overall, 36% of the IP patients tested (47/131) had auto-Abs neutralizing IFN-α2a and/or IFN-ω, 26% (34/131) had auto-Abs neutralizing both, <1% (1/131) had auto-Abs neutralizing only IFN-α2a, and 10% (13/131) had auto-Abs neutralizing only IFN-ω.