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Superposition of the acceptor stems available from co-crystals containing relevant configurations of the 3′-CCA terminus. The 3′-terminal adenosine is shown as colored spheres; Class I tRNAs are colored different shades of green; Class II different shades of blue. Those for aromatic amino acids (Phe, Trp) are colored shades of red as they penetrate the population of the opposite class.
