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
1994862
1995676
1996768
19971,080
19981,504
19991,842
20001,962
20012,133
20022,297
20033,107
20043,952
20054,193
20064,855
20075,542
20085,336
20095,618
20105,843
20115,790
20126,262
20136,888
20148,124
20157,643
20168,502
20179,170
20189,316
201910,321
202011,820
202111,423
202213,262
202313,849
202414,223
20252,218