S. S. Pertsov - Dr. Sc. (Med.), Professor, Deputy Director, P.K. Anokhin Institute of Normal Physiology (Moscow). E-mail: s.pertsov@mail.ru

I.P. Butkevich - Dr. Sc. (Biol.), Leading Research Scientist, I.P. Pavlov Institute of Physiology, RAS (St.-Petersburg). E-mail: irinabutkevich@yandex.ru; V.A. Mikhailenko - Ph.D. (Biol.), Senior Research Scientist, I.P. Pavlov Institute of Physiology, RAS (St.-Petersburg). E-mail: viktormikhailenko@yandex.ru