indomethacin ( 0.28 microm ) sq 29548 ( 1 microm , thromboxane a2 receptor antagonist ) , saralasin ( 1 microm , angiotensin ii receptor antagonist ) or the free radical scavengers , superoxide dismutase ( 60 u/ml ) and catalase ( 40 u/ml ) did not inhibit the initial vasoconstriction , suggesting it was not mediated through endothelially generated thromboxane a2 , angiotensin ii or oxygen-derived free radicals .
C0036193
saralasin
C0003009
angiotensin ii