PDB Statistics: Number of Unique Protein Sequences within Released PDB Structures (Annual) at Identity 95%

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
198319
198414
198518
198615
198717
198835
198956
199075
199189
1992100
1993330
1994678
1995562
1996648
1997918
19981,200
19991,548
20001,679
20011,806
20021,981
20032,674
20043,390
20053,697
20064,189
20074,715
20084,587
20094,788
20104,870
20114,780
20125,127
20135,567
20146,740
20156,316
20166,924
20177,682
20187,673
20198,475
20209,816
20219,500
202211,159
202311,713
20242,877