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Residues 43–51 in apo BA NaMNAT are shown in green with a 2F o − F c electron-density map at 1σ in blue. Part of a symmetry-related molecule is shown in yellow. Crystal packing between the two chains is obvious and could account for the stability of the loop 43–51. These residues are not visible in the BS apo structure, which does not have the same packing.
