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. 2004 Nov 2;32(19):5827–5833. doi: 10.1093/nar/gkh904

Figure 1.

Figure 1

Pre-ribosomal RNA processing in S.cerevisiae. (A) Structure of the rDNA transcription unit. Thick bars represent the mature 18S, 5.8S and 25S rRNA sequences and thin bars represent the spacer sequences. Processing sites and the location of probe 1 used for the primer extension assay are depicted. Note that this primer is located upstream from site A0 and, thus, will only detect unprocessed (35S) pre-rRNA. (B) The pre-rRNA processing pathway. The pre-ribosomal particles containing the different processing intermediates are indicated.