Brain from 249 F2 female and male mice (animals fed a high fat "Western" diet from 8-24 weeks of age.) derived from C57BL/6J and C3H/HeJ parental strains with both on ApoE null backgrounds. All samples were compared to a common pool created from equal portions of RNA from each of the samples. Keywords=Genetics of Gene Expression Keywords=C57BL/6J Keywords=C3H/HeJ