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By Elizabeth Ness MacBean Ross, James Ness MacBean, Ross

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A recent study has described the use of a novel panel of four MoABs to 27 classify subsets of cells within the thymic microenvironment, two for medullary RE cells and HBs (His-39 and RMC-20) and two for cortical RE cells (His-37 and RMC-17). On the 15th day of gestation, MHC class I and class II molecules can also be identified on thymic RE cells, although they reach their highest density around birth (316, 319, 336). The three well defined and biochemically characterized thymic hormones, Facteur Serique Thymique [FTS/thymulin (321, 322)], thymosin-α and thymopoietin (317, 318) have also been detected in the cells of the RE network and in HBs.

4 , and presence of common + leukocyte antigen (CLA ). Medullar RE cells display MHC Class II (HLA-DP, HLA-DQ, HLA-DR) molecule restriction. These cells also contain transforming growth factor-β (TGF-β) type II receptors and participate in the positive selection of T lymphocytes. Transmission electron microscopic (TEM) observations have defined four functional subtypes of medullar RE cells: undifferentiated, squamous, villous, and cystic. All subtypes are connected by desmosomes. Immunocytochemical observations have shown that the secreted thymic hormones, thymosin α1 and thymopoietin (and its short form, thymopentin or TP5), are produced by the same RE cells.

1. functions of the thymic stromal microenvironment (1-11). We agree with Trainin (12) that Maximow (13, 14) was the first thymologist to mention a close cellular interaction between thymic RE cells and the maturating thymocytes. He first suggested the production of a chemotactic (humoral) substance by INTRODUCTION After detailed descriptions of histogenesis, thymic research has increasingly aimed at a better understanding of intrathymic T lymphocyte maturation and differentiation, one of the main 17 18 the RE cells of the thymic microenvironment involved in the immigration of lymphopoietic stem cells into the thymus.

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