The mesenteric, mediastinal, and popliteal lymph nodes of rats were studied by indirect immunoperoxidase method using monoclonal antibodies to cytochrome P450 1A1/1A2 after oral treatment with benzo[a]pyrene. These cytochrome forms were detected in monocytes, macrophages, reticular and littoral cells, cell detritus, and liquid contents of the paracortical and medullary sinuses of all studied lymph nodes. The results indicate that exo- and endogenous toxic substances are oxidized not only in the liver, but also in lymph nodes.
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