In situ characterization in freezefractured mouse thymuses of lymphoepithelial complexes ultrastructurally similar to isolated thymic nurse cells
Scanning and transmission electron microscopy of the cracked surfaces of cryofractured pre-fixed C57BL/Ka mouse thymus reveals the existence of cell complexes, distinct from the surrounding cell organization, in which groups of lymphocytes are delimited by large cytoplasmic sheets or envelopes
Scanning and transmission electron microscopy of the cracked surfaces of cryofractured pre-fixed C57BL/Ka mouse thymus reveals the existence of cell complexes, distinct from the surrounding cell organization, in which groups of lymphocytes are delimited by large cytoplasmic sheets or envelopes
These complexes, located in the subcapsular and cortical regions, display morphological features similar to that of the thymic nurse cells, which can be isolated from the mouse or human thymus enzymatically dissociated
They can be considered as dynamic systems able to modify their three-dimensional organization, namely with regard to intrathymic cellular traffic involved in T-lymphocyte maturation
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