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

	Tissues		CD150#	DC-SIGN	Co-localization	n
Upper respiratory tract	Buccal cavity	Epithelium	0	0	0	1
		Sub-epithelium	+	+++	0/+
	Pharynx	Epithelium	+	0	0	1
		Sub-epithelium	+	+++	0
	Tonsillar crypt	Epithelium	0/+	0	0	2
		Sub-epithelium	+	+++	0
Lower respiratory tract	Trachea	Epithelium	0	0	0	2
		Sub-epithelium	0/+	++	0
	Bronchus	Epithelium	0	0	0	2
		Sub-epithelium	0	++	0
	Lung	Interstitium	0/+	0/+	0	2
Lymphoid tissue	Tonsil	Folicle	+++	+++	++	3
		Inter-folicular	+++	+++	++
	Lymph node	B-cell area	+++	+	+	1
		T-cell area	+++	++	++
		Medullary sinus	+++	+++	+++

^#The number of DC-SIGN⁺- or CD150⁺- cells was determined by counting the number of positive cells, divided by the total number of cells, based on the nuclei staining. The double-positive cells were divided by the total number of stained cells, to determine the co-localization. 0 = 0–1%, + = 1–5%, ++ = 5–25%, +++ = 25–100% of the cells, n = number of donors analyzed per tissue.