Table 2.

Secondary structure assignments of PDB versus PDB‐REDO

N‐term	REDO longer	REDO shorter
1	1,500	1,298
2	660	268
3	303	310
>3	230	87
C‐term	Longer	Shorter
1	9,761	6,368
2	2,256	1,106
3	637	459
>3	531	220

Notes: The DSSP assignments were compared of 135K helices that were at least six residues long in the PDB‐REDO entry. We then asked how often the helix in PDB‐REDO was shorter or longer than in the corresponding PDB entry. In 1500 cases, the helix in the PDB‐REDO entry was one residue longer than in the corresponding PDB entry. Re‐refinement by PDB‐REDO tends to make helices more often longer than shorter. 4% of the residues assigned differently near helix ends are assigned strand in one of the two files. 108K helices were equally long in the two corresponding entries.