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β-Gal-specific proliferative response of CD4+ enriched spleen cells from mice orally immunized with either MvP101(pAH97) (■), HH104(pAH97) (●), SL7207(pAH97) (⧫), or carrier alone (▴). Cells were restimulated in vitro during 4 days with different concentrations of soluble β-Gal. Values are expressed as mean counts per minute of triplicates; standard errors of the means were in all cases lower than 10%. Background values obtained from wells without stimulating antigen were subtracted.
