1. Laboratory of Molecular Genetics, Department of Molecular Biology, University of Gdańsk, Kladki 24, 80‐822 Gdańsk, Poland
2. Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Laboratory of Molecular Biology affiliated to the University of Gdańsk, Kladki 24, 80‐822 Gdańsk, Poland
3. Department of Medical Microbiology, University of Sheffield Medical School, Beech Hill Road, Sheffield. S10 2RX, UK.