“…Gene expression in fixed material has been investigated with different fixatives in various tissues, including the brain (Cummings et al, 2001;Relf et al, 2002;Scheidl et al, 2002;Van Deerlin et al, 2002). Each fixation method was found to have a specific impact on the integrity and yield of mRNA (O'Dell et al, 1998;Srinivasan et al, 2002), probably introducing errors in the interpretation of expression data. Formalin fixed, paraffin embedded tissues in general gave rise to a low yield and rather poor quality of RNA, whereas ethanol fixed tissue yielded a relatively intact RNA gene expression profile (Finke et al, 1993;Foss et al, 1994;Karlsen et al, 1994;Macabeo-Ong et al, 2002;Rupp and Locker, 1988;Serth et al, 2000;Shibutani et al, 2000;Specht et al, 2001;Stanta and Schneider, 1991).…”