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Comparison of structural motifs in crystal structures of three different RNAs A) tRNA (PDB ID: 1EHZ), B) P4-P6 domain of group I intron (PDB ID: 1GID), and C) Group IIC intron (PDB ID: 4FAW). RNA structures share many common structural elements such as coaxial stacking that is common in all the three RNAs shown here, yet large RNAs possess additional motifs, which make structure prediction a challenging problem.
