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The native secondary structure and tertiary structure of the hepatitis delta virus (HDV) ribozyme precursor. (A) Its native secondary structure. (B) The tertiary structure (PDB 1SJ3; http://www.wwpdb.org/). (C) The tertiary structure predicted by pk3D. The helices in B and C are colored in the same code. The loops are shown in orange dashed lines to illustrate chain connectivity. The structure generated by pk3D contains most features of the X-ray structure.
