1. Institut Jacques Monod, UMR 7592 CNRS−Universites Paris 7−Paris 6, 2 place Jussieu Tour 43, 75251 Paris Cedex 05, France, Institute of Chemical Biology and Fundamental Medicine, Siberian branch of The Russian Academy of Sciences, pr. Lavrentieva 8, 630090 Novosibirsk, Russia, Engelhardt Institute of Molecular Biology, The Russian Academy of Sciences, Vavilova 32, Moscow 119991, Moscow, Russia