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Poly(ADP-ribose) polymerase (PARP)-1 has recently been shown to promote tumour progression. Since angiogenesis is an essential requirement for tumour growth, we examined whether PARP inhibition/deletion might affect endothelial cell functions. To this end, the influence of PARP inhibitors on endothelial cell proliferation, migration, tube formation and angiogenesis in PARP-1 knock-out mice, using...