Mice were anesthetized and PBS (20 μL), either alone or containing recombinant mouse IL-23 (500 ng; Biolegend, San Diego, CA, USA), was injected intradermally into the ears, using a 30 gauge needle, for five consecutive days. Ear thickness was measured prior to injection at day 0, and thereafter, on days following cytokine injections, using a dial thickness gauge (Jiuliang, Shanghai, China). All tests were performed blinded.
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