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Course of L. donovani infection in livers of wild-type C57BL/6 (open circles) and CD40L−/− (closed circles) mice. Results shown are means ± standard errors of the means (SEM) of values from two experiments with 8 to 10 mice for each time point. P is <0.05 for control versus CD40L−/− mice at weeks 3, 4, and 8.
