Inhibition of the PMN-derived NO release activated by LTB₄, LTD₄, or LTC₄ after treatment with SK&F 104 353 or CP-105,696 (both at 10 μmol/L), as percent of similarly treated PMN, but without the specific receptor antagonist. The release of NO from activated PMN, without receptor inhibitors, was for LTB₄ 232 ± 50, for LTC₄240 ± 99, and for LTD₄ 145 ± 67 pmol/10⁶PMN. The NO release was measured at 30 minutes after activation and performed as detailed in Materials and Methods section. Mean ± SEM; n = 4.