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. 2007 Jun 22;35(14):4608–4618. doi: 10.1093/nar/gkm481

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© 2007 The Author(s)

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Gene organization of BsrDI and BtsI R-M systems. ORF3 upstream of BsrDI R-M genes encodes a putative transposase. The ORF lengths are not drawn to scale. ORF1 = bsrDIRB, encoding BsrDI B subunit (Nb.BsrDI, large subunit); ORF2 = bsrDIRA, encoding BsrDI A subunit (small subunit). ORF S = btsIRA, encoding BtsI A subunit (small subunit); ORF L = btsIRB; encoding BtsI B subunit (Nb.BtsI, large subunit).