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The missing N-terminal residues that were built in the current study. (a) The vdW representation of newly built residues. The basic residues (Lys and Arg) were colored in blue. The pre-existing residues in the crystal structure were also shown in cartoon with subunit A in blue, subunit B in red, and subunit C in gray. (b) The three subunits were superimposed to show the difference on the conformation of the newly built residues. The color of the subunits are the same as in (a).
