Affiliation: | (1) Department of Genetics, University of Helsinki, P.O. Box 17 (Arkadiankatu 7), SF-00014 Helsinki, Finland;(2) State Institute for Genetics and Selection of Industrial Microorganisms, 1 Dorozhnyi 1, 113545 Moscow, Russia;(3) Research Laboratories, Alko Ltd., P.O. Box 350, SF-00101 Helsinki, Finland |