Figure 1. DC-SIGN⁺-dendritic cells are present in the sub-epithelial tissues of the respiratory tract.

(A,B) Cryosections of different tissues from healthy donors were stained for the expression of DC-SIGN (green) and CD150 (red) using specific antibodies, and for the nuclei using Hoechst (blue). The sections were analyzed by fluorescence microscopy. (A,B) Representative photos with a magnification of 100× are depicted (e = epithelium; s = sub-epithelial tissue, i = inter-follicular, f = follicles, m = medullary sinus, p = paracortex, arrow = autofluorescence, * = co-localization).