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Pleiotrophin (PTN) is a heparin-binding growth factor involved in angiogenesis during development and tumor growth. Plasmid therapy with PTN also induces angiogenesis after myocardial infarction. During aging, angiogenesis is impaired and we therefore examined whether a growth factor therapy with PTN is able to restore neovascularization.We evaluated the PTN effects on capillary-like endothelial sprouting...