Dendritic cell precursors are enriched in the vascular compartment of the lung.

Abstract excerpt

The vast mucosal interface separating external from internal compartments of the lung is under the surveillance of a population of blood-borne, bone marrow-derived dendritic cells (DC) characterized by constant turnover. Because these sentinel cells process foreign antigens that have penetrated the epithelial barrier and transport them to local lymph nodes, they require continuous replenishment by blood-borne...

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