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Trouble shooting for partially ordered ligands. (A) The difference electron density map in the area of the ligand. (B) The ligand adenosylmethionine as modeled in the deposited structure in the PDB (1v2x). (C) A full ligand as built with ARP/wARP. (D) A partial ligand (with the methionine moiety up to its Cβ atom removed) built with ARP/wARP, which matches the density better.
