Differential expression of vWF mRNA in ECs from different tissues. The relative level of expression of vWF mRNA in murine tissues was compared by in situ hybridization. (A) and (B) show the lung at an original magnification of × 250 (A) and × 400 (B). Arrows denote pulmonary arteries and veins. Arrowheads indicate microvascular ECs surrounding alveoli. (C) and (D) show brain (original magnification × 250). Arrows in (C) denote cerebral arteries and veins. Arrows in (D) indicate small vessels. Arrowheads denote microvessels in the cerebral cortex. (E) shows a section of liver (original magnification × 250). Arrows indicate hepatic veins. (F) and (G) show sections of kidney (original magnification × 250). Solid arrows denote renal arteries and veins; open arrows indicate glomeruli. All slides were exposed for 12 weeks.