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[Individual peculiarities in the reaction of jejunum lymphoid structures in rats exposed to stress].

Using a complex of morphological methods, the peculiarities in the reaction of jejunum lymphoid structures were studied in 105 Wistar rats with reference to their behavioral characteristics (stress tolerance). Initially, in passive (stress prone) rats the number of lymphoid and plasma cells was higher than in active animals, together with the macrophage reaction, which may indicate greater activity of immune structures in this group of animals. In behaviorally active rats, the negative impact of stress was less pronounced; rehabilitation processes were faster, as compared to those in passive animals. By day 14 after the end of the experiment, the restoration of cell population of lymphocytes was observed in the wall of the intestine in the active animals, while in the passive rats, the processes of destruction of lymphocyte cell line was increased together with the macrophage response.