However, depletion of LCs and Langerin+ dermal DCs did not affect the size of the overall CD4+ CD25+ FoxP3+ Treg population in sdLNs of VitD‐induced AD mice (Fig. S3A and B) but specifically abolished the induction of thymus‐derived Tregs (Fig. 5). Here, FOXP3 is linked to Alzheimer disease.