Additional file 3: Figure S1.

Age dependent expression of IL-4 in healthy control subjects. In two cohorts separated by age (43 vs. 53 years), healthy control groups show significant differences in IL-4 expression while levels in CFS subjects are comparable across studies [16].

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Smylie et al. BMC Immunology 2013 14:29   doi:10.1186/1471-2172-14-29