Dmitriev Sergey G. RussiaMoscowN. K. Koltsov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow 119334, Russialinvoice@mail.ru Author's articles EVOLUTIONARY AND ECOLOGICAL ASPECTS OF GENETIC VARIABILITY IN POPULATIONS OF SICISTA BETULINA (RODENTIA, DIPODOIDEA) FROM VALDAI HILLS