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Effects of IL-21 on LPS-induced apoptosis in mouse peritoneal macrophages. Macrophages (1 × 106) were incubated with IL-21 (100 ng/mL) in the presence or absence of LPS (100 ng/mL) for 24 h and were stained with FITC-conjugated Annexin V and propidium iodide (PI). Values are presented as mean ± SD of three independent experiments. *P < 0.05 compared with the LPS group.
