Spacer promoters are essential for efficient enhancement of X. laevis ribosomal transcription

The X. laevis ribosomal DNA spacer contains duplicated RNA polymerase I ”spacer promoters“ and an array of repeated 60 81 bp promoter-related sequences. The latter have been shown to enhance transcription from a 40S preribosomal RNA promoter in cis. Here we present evidence that at least one spacer...

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