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snoRNA expression during P19 time course. RNA from each time point (5 μg per lane) and from C57Bl6/J mouse brain was separated by agarose/formaldehyde gel electrophoresis. Northern blots were hybridized with MBII-52 and MBII-85 snoRNA oligomers as previously described (20). A β-actin probe is used as a control.
