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Effect of the test compounds on IL-4 production in CHS induced by DNFB (a) or oxazolone (b) 24 and 96 h after challenge. Data represent mean±s.e.m. of at least four different animals. **P<0.01, *P<0.05 after Newman–Keuls test as compared with control group. CHS, contact hypersensitivity; DNFB, dinitrofluorobenzene; IL, interleukin.
