ATLa, o-[9,12]-benzo-ω6-epi-LXA4, or [9,14]-benzo-ω6-(R/S)-LXA4 were injected by intravenous bolus injection (0.5, 5, 15, 25 or 50 μg kg−1 in 100 μL of sterile saline) via the tail vein of 6-8-wk male FVB mice followed by peritoneal injection of zymosan A (1 mg/1 mL). Peritoneal lavages were collected (2 h) and total leukocytes, PMNs and monocytes were enumerated. Reduction in PMN infiltration was determined by comparison to vehicle control (100 μL of sterile saline). A. Dose-response comparison between ATLa (■) and o-[9,12]-benzo-ω6-epi-LXA4(○). B. Dose-response comparison between ATLa (■) and [9,14]-benzo-ω6-(R/S)-LXA4 (○). Values represent mean ± SEM, n=3-5, *P < 0.0001, §P < 0.05.