Assertion: serotonin | /r/CapableOf | entail smaller grades of angiostatin
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text: Serotonin does not enhance tumor cell expansion but acts as a controller of angiogenesis by decreasing the expression of matrix metalloproteinase 12 (MMP-12) in tumor-infiltrating macrophages, entailing smaller grades of angiostatin—an endogenous inhibitor of angiogenesis.