1. IBS-Viridian Ltd., 114-116 John Wilson Business Park, Thanet Way, Whitstable, Kent CT5 3QT, U.K., EA Technology Ltd., Capenhurst, Chester CH1 6ES, U.K., Oxford Centre for Environmental Biotechnology, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, and NERC Institute of Virology & Environmental Microbiology, Mansfield Road, Oxford OX1 3SR, U.K.