PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 90%

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
198110
198223
198318
198414
198518
198615
198717
198835
198956
199075
199187
199298
1993322
1994646
1995545
1996636
1997898
19981,168
19991,514
20001,642
20011,773
20021,936
20032,617
20043,318
20053,644
20064,091
20074,623
20084,495
20094,681
20104,762
20114,676
20124,976
20135,387
20146,514
20156,106
20166,644
20177,379
20187,368
20198,093
20209,374
20219,074
202210,609
202311,168
20242,432