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Relative abundance of classes Clostridia and Bacteroidia with time. Diagnosis: CD = Crohn’s disease, JIA = juvenile idiopathic arthritis. Colours by therapy of anti-TNFα: red = stool sample taken while on anti-TNF; blue = stool sample taken when no anti-TNF was administered. The p-value is corrected for the number of tested taxa using multi-level modelling.
