The presence of lymphocytes with internal IgA among cells from rat thoracic duct lymph wdy. The number of cells detected was greater in animals kept in a convential animal house compared with those maintained under specific pathogen-free conditions. Thoracic duct lymph from B rats and adult thymectomized rats also contained cell with internal IgA. The surface Ig of the IgA-containing cells was studied using a double-labeling technique with (126I) anti-Ig to detect surface Ig, and fluorescein-conjugated anti-IgA in large amounts, but very little IgM and no surface IgG2. The surface IgA was not acquired passively.
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