In situ fluorescence of the mutant strain
CBF5-AUU and the parental wild-type strain. DAPI stains
of the nucleoplasm are blue in all views. The fluorescein-labeled probe
to the introns of pre-tRNAs are green, and the Cy3-labeled probe to U14
nucleolar RNA is red. In the wild-type strain, most of the pre-tRNA
signal is colocalized to the nucleolus, along with the U14 snoRNA,
although there are some secondary loci of pre-tRNA staining. In the
CBF5-AUU strain, the U14 nucleolar signal is slightly
fragmented, but the pre-tRNA signal is dispersed to the nucleoplasm.