Abstract
The monoclonal antibody DLT15 specifically recognised antigenic determinants expressed during development of thymic lymphoid cells of the sea bass Dicentrarchus labrax(L.). They were first detected at day 30 post-hatching in the thymus of fish maintained at 16° C; thereafter, a marked increase in the number of immunoreactive cells occurred mostly in the outer region of the thymus. The appearance of DLT15-immunoreactive cells in the lymphoid organs was in the sequence thymus, head-kidney and spleen. The thymus thus appears to be a primary lymphoid organ in the sea bass. Infrequent cells sharing the antigenic determinants expressed on thymocytes were localised in the developing head-kidney and spleen.
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