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Possible base quintuple formed among P4bp5, P4bp6 and J8/7-5. Arrows indicate the polarity of the phosphodiester backbone. Solid lines with two arrowheads indicate the previously proposed tertiary interaction between P4bp5 and J8/7-5 (22,23). The combination of the possible base quintuples in (A) the Azoarcus IC3 ribozyme, (B) the Synechococcus IC3 ribozyme and (C) the Tetrahymena IC1 ribozyme.
