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. 2009 Oct 19;4(10):e7505. doi: 10.1371/journal.pone.0007505

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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NTS: non-transcribed spacer, also known as the intergenic region; ETS: external transcribed spacer; ITS: internal transcribed spacer. rRNA transcription starts at the 5′ end of the ETS, with the first 414 nucleotides comprising the leader sequence. The non-coding (nc) r-RNA transcript is initiated upstream of the ETS.