Female C57BL/6 mice were injected intraperitoneally with 50 µg of chitin particles from shrimp shells (C9752, Sigma-Aldrich) for 3 hr to induce M2 macrophages, followed by the first dosage of GW4064 (30 mg/kg) and 2 mg/kg LE540 or vehicle control. A second dose of GW4064 and LE540 at the same concentration as the first was then administered and the peritoneal macrophages collected for analysis.
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