Laboratory of Theoretical Genetics, Institute of Cytology & Genetics, 630090, Lavrentiev Ave. 10, Novosibirsk, Russia. levitsky@bionet.nsc.ru|Laboratory of Theoretical Genetics, Institute of Cytology & Genetics, 630090, Lavrentiev Ave. 10, Novosibirsk, Russia. levitsky@bionet.nsc.ru|Laboratory of Theoretical Genetics, Institute of Cytology & Genetics, 630090, Lavrentiev Ave. 10, Novosibirsk, Russia. levitsky@bionet.nsc.ru|Laboratory of Theoretical Genetics, Institute of Cytology & Genetics, 630090, Lavrentiev Ave. 10, Novosibirsk, Russia. levitsky@bionet.nsc.ru