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Production of IL-10 by spleen cells from C57BL/6 or BALB/c mice infected with Mycobacterium avium 25291. Cells were stimulated with 4 μg/ml concanavalin A for 72 hr and the concentration of IL-10 was determined by ELISA. Statistically significant differences according to the Student's t-test are labelled ** for P < 0·01.
