Author information:
(1)Genomic and Applied Microbiology & Göttingen Genomics Laboratory, 
Georg-August-University Göttingen, Göttingen, Germany.
(2)The Clostridia Research Group, BBSRC/EPSRC Synthetic Biology Research Centre, 
School of Life Sciences, Centre for Biomolecular Sciences, University of 
Nottingham, Nottingham, United Kingdom.
(3)Unilever, Research and Development, Bedford, United Kingdom.
(4)The Clostridia Research Group, BBSRC/EPSRC Synthetic Biology Research Centre, 
School of Life Sciences, Centre for Biomolecular Sciences, University of 
Nottingham, Nottingham, United Kingdom nigel.minton@nottingham.ac.uk.