Institution: | (1) Department of Biological Sciences, University of Durham, South Road, DH1 3LE Durham, England, UK;(2) I.P.S.R., Trumpington, CB2 2LQ Cambridge, England, UK;(3) Present address: Astromed Ltd., Innovation Centre, Cambridge Science Park, CB4 2LQ Cambridge, England, UK;(4) Present address: Department of Botany, Tanta University, Egypt |