When perusing through the text version of a PDB file, I noticed in records that begin with "ATOM," there are x, y, and z coordinates for these atoms.
How is the origin of each molecule's Cartesian coordinate system determined by RCSB?

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    $\begingroup$ They are just arbitrary numbers, the only thing which matters are the relative coordinates. The relative coordinates themselves are determined mostly by X-ray crystallography or NMR. $\endgroup$ – Ashafix Jun 6 '16 at 22:18

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