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Granule-containing mast cells (MCs) are present in the inferior vena cava (IVC) wall, and their number decreases with thrombosis. A, IVCs from wild-type mice were frozen-sectioned and stained with Toluidine blue. MC is indicated by arrow. L, lumen. B, MCs were counted in transverse sections of intact IVCs (black bar, n=11), IVCs after 48 h stenosis with a thrombus (gray bar, n=11), and IVCs after 48 h stenosis that did not result in thrombus formation (patterned bar, n=7).
