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Effect of antibody treatment during the chronic challenge period on expression of T helper type 17 (Th17) cytokines. Levels of expression of mRNA for (a) interleukin (IL)-17A, (b) IL-17F and (c) IL-6 by CD4+ T cells, relative to hypoxanthine phosphoribosyltransferase (HPRT). Significant differences compared to naive animals shown as **P < 0·01 and ***P < 0·001, compared to control animals shown as ##P < 0·01.
