Blood-derived dermal langerin+ dendritic cells survey the skin in the steady state.
Ginhoux F, Collin MP, Bogunovic M, Abel M, Leboeuf M, Helft J, Ochando J, Kissenpfennig A, Malissen B, Grisotto M, et al. J Exp Med. 2007 Dec 24; 204(13):3133-46. Epub 2007 Dec 17.