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DMBA contact-hypersensitivity response in C3H and A-strain mice. Panels of mice that were sensitized to 100 μl of DMBA and were ear-challenged with 20 μl of DMBA served as positive controls. Panels of mice that were only ear-challenged with 20 μl of DMBA served as negative controls. Positive controls are the solid bars; negative controls are the shaded bars.
