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. 2011 Apr 27;39(15):6608–6619. doi: 10.1093/nar/gkr261

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© The Author(s) 2011. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 8. — Isolated B boxes on the extrachromosomal rDNA palindromic sequence. (A) The left arm of the palindromic sequence (∼40 kb in length) is shown, with the ‘central region of asymmetry’ (CRA) displayed to the right. Black arrows represent the rRNA genes. Arrow heads below the black line indicate B boxes located on the upper (white) and lower (gray) DNA strand. The white arrows above the black line indicate the two indistinguishable TRE5-A^bsr integration sites shown in detail in Figure 7B. (B) Sequences of the B boxes located on the left arm of the rDNA palindromic sequence. Position numbers refer to GenBank entry AY171066. The consensus B box motif GTCnnnnGTTCRAnYC is highlighted in red. The arrows indicate the two indistinguishable TRE5-A^bsr integration sites. (C) WebLogo (53) alignment of intragenic B boxes (upper panel), extra B boxes found downstream of most D. discoideum tRNA genes (middle panel) and isolated B boxes found in the rDNA element (lower panel).