Which cells line lymph capillaries and allow fluid permeability?

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Endothelial cells line lymph capillaries, and their specialized junctions form tiny overlapping flaps that act like minivalves. This arrangement creates gaps that are open to interstitial fluid and small molecules, allowing easy entry into the capillaries and giving lymph capillaries high permeability. Valves in lymph vessels are structures that prevent backflow in larger vessels, not the lining of the capillaries. The interstitium is the surrounding tissue fluid, not the lining itself. Lymphatic tissue refers to immune-related tissues, not the capillary lining. So the cells responsible for lining lymph capillaries and enabling fluid permeability are endothelial cells.