title: [Seasonal involution of the lymphoid tissue of the spleen of the European suslik (Citellus citellus L.)].
abstract: The spleen of male immature ground squirrels has been studied throughout the year using histological, histochemical and cytochemical methods. Histo-architectonical and cytological changes in the splenic lymphoid tissue within the annual cycle have been established. They consist of its gradual hypertrophy up to the midsummer, followed by involution at the summer end and the beginning of the autumn. The deepest involutive changes in the structure and cell composition have been established during the first stage of hibernation--November--December. An obvious proliferation and hypertrophy of the lymphoid tissue during the second stage of hibernation (January--March) is observed.
mesh_terms: D000818:Animals; D002452:Cell Count; D006605:Hibernation; D008214:Lymphocytes / Q000166:cytology; D008297:Male; D008938:Mitosis; D010950:Plasma Cells / Q000166:cytology; D012589:Sciuridae / Q000033:anatomy & histology*; D012621:Seasons; D013154:Spleen / Q000033:anatomy & histology* / Q000166:cytology
vernacular_title: Sezonnaia involiutsiia limfoidnoĭ tkani selezenki evropeĭskogo suslika (Citellus citellus L.).