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Fig. 3. Association of GFP-Sam68 granules with RNA. (A) Confocal images of dendritic localization of GFP-Sam68 in hippocampal neurons showing fluorescent granules (green fluorescence, GFP-Sam68) that colocalize in three regions (yellow fluorescence, merged image) with RNA labeling by ethidium bromide (red fluorescence). Percentage of colocalization of GFP-Sam68 and ethidium bromide. Error bar represents s.d. (n=100). (B) RNAse I treatment of the EtBr labeling of neurons. (C) DNAse I treatment of the EtBr labeling of neurons. (D) Binding of immunoprecipitated Sam68 from adult rat cortex with ß-actin mRNA. RT-PCR with specific ß-actin primers was carried out with AD1 anti-Sam68 antibody immunoprecipitation (lane 1), with preimmune IgG immunoprecipitation (lane 2), with total extract (lane 3) or with no input (lane 4).