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The transcription and expression of IL-10 after papaverine pretreatment. Primary microglia were pretreated with papaverine (0, 0.4, 2, and 10 μg/ml) for 4 h and stimulated by LPS for another 1 day. The transcription and expression of IL-10 were detected by RT-PCR and ELISA, respectively (n = 5). *P < 0.05 versus LPS group, **P < 0.01 versus LPS group
