Happy Christmas and a great new year everyone. Cheers Bob; Scotland, home of the good stuff. And I'm off to sample it. :-)))))))))) -- Robert Hartley, Centre for Cell Engineering,University of Glasgow, Glasgow G12 8QQ Tel:++44(0)141 330 4756 Fax:++44 (0)141 330 3730 mailto:rh at mblab.gla.ac.uk Web : http://www.gla.ac.uk/Inter/CellEngineering