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Macroscopic observation, Histological staining (H&E) and Immunofluorescence staining (CD31) of subcutaneously implanted P:P and P:P:Bs grafts. H&E and CD31 staining showing accelerated angiogenesis (arrows) in P:P:B1 and P:P:B2 grafts. Despite high angiogenesis in P:P:B3 graft, the inflammatory response was observed.
