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Expression of costimulatory proteins on APC subsets. The percentage of the indicated APC subpopulation from B10.D2 mice infected 6 days previously that express CD80 or CD86 above background staining with an isotype control is shown. The values are the means for three (uninfected) and five (infected) mice from three separate experiments. Asterisks indicate values significantly different from the mean for the uninfected group. Error bars indicate standard deviations.
