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B7-1 transgenic mice exhibit exaggerated and persistent contact hypersensitivity responses compared with normal mice.Because B7-1 and B7-2 deliver different costimulatory signals to T cells during antigen presentation, the purpose of this study was to compare B7-1 and B7-2 on keratinocytes and to compare their effects on contact hypersensitivity.Contact hypersensitivity was studied in transgenic mice...