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J. Exp. Med.,
Volume 187, Number 11, June 1, 1998 1813-1823
By

From the * Division of Immunology and Rheumatology, In the principal pathway of
Department of Pathology, Stanford University School of Medicine, Stanford, California 94305
/
T cell maturation, T cell precursors from the bone marrow
migrate to the thymus and proceed through several well-characterized developmental stages
into mature CD4+ and CD8+ T cells. This study demonstrates an alternative pathway in which the bone marrow microenvironment also supports the differentiation of T cell precursors into
CD4+ and CD8+ T cells. The marrow pathway recapitulates developmental stages of thymic
maturation including a CD4+CD8+ intermediary cell and positive and negative selection, and
is strongly inhibited by the presence of mature T cells. The contribution of the marrow pathway in vivo requires further study in mice with normal and deficient thymic or immune function.
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