S.L. Sokolova - Ph.D. (Med.), Senior Lecturer, Department of Biology and General Genetics, Peoples - Friendship University of Russia (Moscow). E-mail: sokolova_sl@pfur.ru N.I. Buyanova - Ph.D. (Med.), Senior Lecturer, Department of Biology and General Genetics, Peoples - Friendship University of Russia. E-mail: buyanova_ni@pfur.ru E.M. Zheludova - Ph.D. (Biol.), Associate Professor, Department of Biology and General Genetics, Peoples - Friendship University of Russia. E-mail: zheludova_em@pfur.ru