Protein Data Bank, a publically available database of molecular structures of proteins

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Do residue sequence numbers in PDB files correspond to the positions in the backbone?

In other words if two residues have sequence numbers, say, 20 and 21 then are they next to each other in the backbone? If no (or not necessarily) then is there any way to find consecutive residues ...
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How to get a pdb file of a single atom?

I am trying to get a pdb file that contains a single atom, it doesn't matter if it's Hydrogen or another atom. How can I obtain this? Are there any pdb files with just a single atom available to ...
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Oligomeric states of Phyre model

Is it possible to generate an oligomeric state for a phyre model? As it lacks crystal packing information "Generate>Symmetry_mates" obviously does not work in PyMol. I assume that the fit is not ...