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. 2004 Jan 1;32(Database issue):D200–D202. doi: 10.1093/nar/gkh026

Table 1. Number of substructures recorded in DSDBASE.

	Full database	Non-redundant (nr) database	Native of nr database
No. of proteins	19 612	2849	766
No. of SS bonds	2 385 617	149 892	2170
Grade^a A	307 003 (12%)	19591 (13%)	1321 (61%)
Grade B	633 431 (26%)	39 804 (27%)	341 (16%)
Grade C	728 374 (30%)	90 497 (60%)	508 (23%)
Grade D^b	716 809 (29%)	–	–

^aPlease see text and Sowdhamini et al. (3) for explanation of grade.

^bCα–Cα and Cβ–Cβ distances were compatible but sulphur could not be fixed geometrically.