Hindlimb/blood supply; Ischemia/therapy; Neovascularization, Physiologic; Adenoviridae/genetics; Angiogenesis Inducing Agents/genetics; Animals; Blotting, Western; Cell Division; Cells, Cultured; Collateral Circulation/physiology; Endothelial Growth Factors/genetics; Endothelium, Vascular/pathology; Female; Femoral Artery/pathology; Gene Expression Regulation; Gene Transfer Techniques; Genetic Vectors; Humans; Lac Operon/genetics; Lymphokines/genetics; Male; Muscle, Smooth, Vascular/pathology; Protein Isoforms/genetics; Rats; Rats, Sprague-Dawley; Regional Blood Flow/physiology; Saphenous Vein/pathology; Vascular Endothelial Growth Factor A; Vascular Endothelial Growth Factors