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A secondary structure of the ai5γ group II intron. The new tertiary interaction μ–μ′ is shown in dark gray. Nucleotides involved in the μ–μ′ interaction (G844, A617 and A618) are highlighted by gray shading. The tandem sheared A·A pairs in the internal bulge of D3 are denoted in light gray by respective symbols according to base-pairing classification by Leontis and Westhof (1998); Leontis et al, 2002).
