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Levels of TNF in sera from healthy donors and leprosy patients (with TT and LL forms and type I and type II reactional states of the disease). The levels of bioactive TNF in human sera were analyzed by cytotoxic assays using L929 cells. Results are expressed as horizontal bars that indicate median values. P values indicate results that are significantly different from results for healthy donors (P < 0.05; Mann-Whitney U test).
