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Canonical and wobble base pairing of tRNA to mRNA. A. Canonical A•U and G•C base pairs. B. Wobble U34○G3, I34○A3, I34○C3, and I34○U3 base pairs. G34○U3 pairings are virtually nonexistent; therefore, the pairing is not shown. The arrows point away from the hydrogen bond donor and toward the hydrogen bond acceptor.
