endothelial cells for angiogenesis science 275 964 967 hybridomas producing monoclonal antibodies directed against cd34 can be obtained from the american type tissue collection rockville md in another embodiment monoclonal antibodies reactive with endothelial cell surface antigens flk 1 or tie 2 are used polyclonal antibodies reactive against endothelial cells isolated from the same species as the one receiving the medical device implant may also be used the term u201c stent u201d herein means any medical device which when inserted into the lumen of a vessel expands the cross sectional lumen of a vessel the term u201c stent u201d includes covered stents such as those covered with ptfe or eptfe in one embodiment this includes stents delivered percutaneously to treat coronary artery occlusions or to seal dissections or aneurysms of the splenic carotid iliac and popliteal vessels in another embodiment the stent is delivered into a venous vessel the stent can be composed of polymeric or metallic structural elements onto which the matrix is applied or the stent can be a composite of the matrix intermixed with a polymer for example a deformable metal wire stent can be used such as that disclosed in u s pat no 4 886 062 to wiktor incorporated herein.