Francisco, I suppose that AP will not be very active anymore in these embedded tissue sections. Did you consider immunostaining? Have a nice weekend, Wolfgang ----- usual disclaimers apply * This message is RNAse free - please don't touch! ----- Wolfgang Schechinger Pathobiochemistry Dept. University of Tuebingen, Germany email: wgschech at med.uni-tuebingen.de * wwWait: http://www.medizin.uni-tuebingen.de/~wgschech/start.htm ------- *unsolicited mail in *NOT* appreciated