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- W1983128247 abstract "T cell precursors are first detected in the thymus at eight weeks of gestation. By 15 to 20 weeks of gestation, T-cell precursors expressing alpha beta and gamma delta T-cell receptors are present in the thymus in numbers relatively similar to those found in postnatal life. However, recent data suggest that T-cell receptor diversity is more limited during fetal and neonatal life than in adults. Additionally, the functional capacity of T cells in the fetus and neonate is immature, in that neonatal T cells express a limited repertoire of lymphokines in response to activation. Specifically, the production of the lymphokines, interferon-gamma and interleukin-4, which participate in the maturation of cytotoxic cells, activation of macrophages, and the maturation and modulation of B cell function and isotype expression, is reduced more than tenfold compared to cells from adults. This appears to result primarily from the lack of memory T cells in the fetus and neonate, reflecting their antigenic naivete. The difference in lymphokine expression is due to diminished transcription of these genes in neonatal T cells in response to activation. Preliminary data indicate that differences in essential promoter elements regulating transcription of these lymphokine genes plays a role in their differential expression in T cells." @default.
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- W1983128247 date "1992-10-12" @default.
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- W1983128247 title "Ontogeny of T Lymphocyte Function in the Neonate" @default.
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- W1983128247 doi "https://doi.org/10.1111/j.1600-0897.1992.tb00774.x" @default.
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