Dietary-induced atherosclerosis in miniature swine I. gross and light microscopy observations: Time of development and morphologic characteristics of lesions. II. Electron microscopy observations: Characteristics of endothelial and smooth muscle cells in the proliferative lesions and elsewhere in the aorta. III. Lipid values: Cholesterol, triglyceride and phospholipid, and esterified fatty acid values in serum and in aortic intima-media tissue. IV. Metabolic studies: In vitro protein synthesis by aortic st