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The functional capacity of human lymphocytes derived from fetal liver and spleen at different stages of ontogeny (16-34 weeks of gestation) was studied using in vitro models (increase in cell volume, [3H]thymidine incorporation, Ig secretion) reflecting various stages of activation induced by mitogens (LPS, PWM) in vitro. Lymphocytes differed in their reactivity to LPS depending on the period of intrauterine development: cells from the early liver could respond with enhanced IgM production whereas lymphocytes derived from this organ after more than 25 weeks failed. The opposite was found to apply to spleen cells: only lymphocytes derived from the organ after more than 25 weeks showed significant LPS-induced in vitro differentiation. These data were in correlation with the proliferative response to LPS. It was clear that the number of CD20-positive mature B cells in the lymphocyte preparations was not responsible for these results, since comparable yields were found throughout the period of fetal development of the liver studied, whereas in the spleen increasing numbers of B cells were seen.
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