1. Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda Boulv. 4, Riga LV-1586, Latvia
2. Biosystems Group, Department of Computer Systems, Latvia University of Agriculture, Liela Iela 2, Jelgava LV-3001, Latvia
3. Department of Biological and Medical Sciences, Oxford Brookes University, Headington, Oxford OX3 0BP, UK