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CCL26 production in HaCaT cells was determined by ELISA when they were stimulated with IL-4, leflunomide, JAK inhibitor 1 or JAK3 inhibitor 1. Leflunomide and JAK inhibitor 1, but not JAK3 inhibitor 1, significantly inhibited the IL-4-enhanced CCL26 production from HaCaT cells. The error bars indicate standard error. **P < 0·05 for the inhibitory effect.
