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Delayed-type hypersensitivity (DTH) measured as an increase in skin fold thickness 24 h after an intradermal injection of phytohemagglutinin (mean ± SD): C – control, Pre1 – prebiotic 1, Pre2 – prebiotic 2, Syn1 – synbiotic 1, and Syn2 – synbiotic 2. Significant difference a,b; * p < 0.05 within time groups.
