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Structural comparison of A-platform binding sites for monovalent cations in the large ribosomal subunit (A) and the P4-P6 domain of the group I intron from Tertrahymena thermophila (B). Coordinates for (B) were taken from PDB #1GID. In both cases the AA-dinucleotide (red) is shown with surrounding RNA nucleotides (gray) and the monovalent cation (green).
