(A) Comparison of heart and spleen sizes between WT and KO mice. Arrow indicates the site of deformity in the lung. Scale bars represent 2 mm. (B) Hematoxylin and eosin-stained images of hearts, lungs, and spleens from WT and KO mice. The heart image shows a cross-section. Scale bars represent 1 mm for the heart and spleen and 200 μm for the lung. Arrow indicates the site of calcification. (C) Heart of a KO mouse with internal calcification. Arrow indicates the site of calcification. (D) Hematoxylin and eosin-stained images of vertically cut hearts from KO mice. Inset shows calcification at the base of the mitral valve. Scale bars represent 1 mm. Arrow indicates the site of calcification.