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Adenine recognition by His462Gln mutant. Superimposition of the atomic models for His462Gln mutant (atom colour) and wild type (green) of CopA-PN. His/Gln462 -Pro463-Ile464 are shown in stereo. The cyan net represents an ∣Fobs∣−∣Fcalc∣ electron density map contoured at 4σ when Gln462 was refined as Gly using the mutant data.
