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Levels of ex vivo cellular production of interferon-gamma decreased compared to baseline over the course of IFN-β therapy in the total group on any IFN-β therapy (p<0.001) and in the group of responders (p=0.013). Compared to non-responders, IFN-gamma levels were lower on treatment in responders (p=0.005). Overlapping error bars are removed for clarity.
