Table 2. Number of PDB structures in different stages of the selection process.

Proteins structures		Steps in the selection process
11836		Initial selection by PDB search
31	(0.3%)	Could not be processed by PDBCUR
23	(0.2%)	Could not be processed by ParsePDB (PDB file contains multiple models)
6	(0.1%)	Could not be processed by ParsePDB (PDB file curation errors)
4	(0.0%)	Curating errors regarding disulfide bond declarations
65	(0.5%)	Could not be processed by STRIDE
0	(0.0%)	Could not be processed by JOY/PSA
11707	(98.9%)	Structures successfully processed
2704		Non-redundant structures selected by PISCES
61		Structures resulting from room-temperature diffraction experiments
2643		Structures used in this study