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. 2015 Mar 16;43(7):3776–3788. doi: 10.1093/nar/gkv224

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© The Author(s) 2015. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Structure of the polyA polymerase Mg561 of Megavirus chilensis. Ribbon representation of the Mg561 homodimer composed of the dimerization domain (D1), the catalytic domain (D2) including the canonical NT domain, the duplicated domain (D3) and the D4 domain. The 90° rotation highlights the central tunnel between the two monomers. Figure 1 color code is applied to one monomer to delineate the D1– D4 domains; the second monomer is in light gray. Cation locations are marked as green balls.