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Tumstatin, an angiogenesis inhibitor with anti-tumor activity in mice, is the bioactive NC1 domain of Col IVa3, the potential significance of tumstatin as an endogenous angiogenesis inhibitor in human is not yet completely understood. This study aimed to develop an enzyme-linked immunoassay (ELISA) for tumstatin to accurately measure its concentrations in biological samples.Recombinant tumstatin as...