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. Author manuscript; available in PMC: 2012 Feb 15.
Published in final edited form as: Biochemistry. 2011 Jan 24;50(6):962–969. doi: 10.1021/bi101724h

Figure 1.

Figure 1

Canonical base pairs (A-C) and four possible CA pairs (D-G) in RNA. Plus and minus signs represent the direction of strands (+/− represent anti-parallel strands and +/+ represent parallel strands).