Should be no difference ( no tricks) Have a look here for some images: http://www.immunoportal.com/ Carl Hobbs FIBMS Histology and Imaging Manager Wolfson Centre for Age-Related Diseases School of Biomedical Sciences King's College London Guys Campus London SE1 1UL Tel.020 7848 6810 fax 020 7848 6816 carl.hobbs <@t> kcl.ac.uk