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Hydrogen-bonding interactions around the N terminus of 3Dpol G64S, shown in stereo. An omit-phased 2Fo − Fc map contoured at 1.4σ shows density including the G64S mutation. Ser64 forms a hydrogen bond with Glu2, which in turn interacts with Gln4 of the N terminus. Gly1 maintains contacts with Ala239. Additional hydrogen bonding interactions are formed between the backbone of the N terminus and the backbone of a neighboring β strand.
