1. Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
2. Koltsov's Institute of Developmental Biology; Russian Academy of Sciences, Vavilov st 26 Moscow 119334 Russia
3. Emanuel Institute of Biochemical Physics; Russian Academy of Sciences, Kosygin st. 4 Moscow 119991 Russia