When I was checking a structure and preparing figures for an upcoming article, I found out that Procheck and Pymol use different criteria to assign secondary structure for residues in a PDB (i.e.: some residues that appeared as loops in the cartoon representation in pymol were assigned as beta-strand in Procheck). I understand that different criteria may exist to do this. Which one is actually used to determine the "HELIX" and "SHEET" lines in the header of a curated PDB?
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