Affiliation: | (1) Present address: Department of Physiology and Environmental Science, Faculty of Agriculture and Food Sciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD, UK;(2) School of Biological Sciences, Donnan Laboratories, The University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UK |