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Abstract

Endothelial fenestrations have been observed in the venules of the large salivary glands of mice. The structure of the fenestrations is similar to those of capillaries. The fenestrations are frequently demonstrated in the endothelium of the transitional portions from a capillary to a venule. They are also seen in overlapping thin cytoplasm located on either the blood or tissue front of the endothelial cells of the venules at cell junctions.