PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 100%

This chart shows the total number of unique protein sequence clusters in PDB structures released within each year. Unique sequence clusters are defined using the sequence identity (SI). A value of 95% SI is used by default, since for practical purposes this identifies proteins with few differences, and thus can be considered to be the same sequence. The chart can also be redrawn with a more stringent 100% SI criterion, or with lower SI values that identify unique protein families (70% SI) or unique protein folds (30% SI).
The annual numbers of protein sequences may be displayed by specific levels of SI, either separately in different charts or simultaneously in the same chart.

Note: The number of unique sequences in the statistics table is linked to the sequence cluster search result page. There is a default precision threshold in calculating the numbers for performance balance. So the statistics count may have a slight discrepancy compared to the actual non-redundant group search result when the result count approaches or goes above 10,000. The group search result page provides an accurate count. The statistics page provides the trend.

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Sequence cluster level:

YearNumber of Unique Protein Sequences
197613
197715
19783
19797
19808
198111
198223
198319
198415
198518
198615
198717
198850
198958
1990101
1991134
1992111
1993453
1994863
1995676
1996768
19971,080
19981,503
19991,840
20001,962
20012,133
20022,297
20033,109
20043,952
20054,190
20064,850
20075,543
20085,335
20095,620
20105,840
20115,791
20126,259
20136,887
20148,118
20157,630
20168,510
20179,153
20189,306
201910,297
202011,807
202111,420
202213,279
202313,853
20243,191