IKBKG and incontinentia pigmenti: Injection of a single intravenous dose of the AAV‐BR1 vector carrying a wild‐type Nemo gene (AAV‐BR1‐NEMO) completely reversed the neurovascular abnormalities in both heterozygous (Nemo−/+) and brain endothelial cell‐conditionally null (NemobeKO) mouse models of IP.