Potentiation of angiogenesis by inhibition of platelet-derived angiostatin. The release of angiostatin was stimulated with 0.1 U/mL thrombin. (A-B) Microscopy of representative experiments. (C) The statistical analysis. Bars are means ± SE from 6 experiments. *P < .05 control versus treatment. Original magnification of A and B, × 100.