Institute of Microbiology and Biotechnology, University of Latvia, Riga LV-1004, Latvia.|Institute of Microbiology and Biotechnology, University of Latvia, Riga LV-1004, Latvia.|Institute of Microbiology and Biotechnology, University of Latvia, Riga LV-1004, Latvia.|Institute of Microbiology and Biotechnology, University of Latvia, Riga LV-1004, Latvia.