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
197713
19783
19797
19807
198111
198223
198319
198414
198518
198615
198715
198835
198956
199077
199188
199298
1993328
1994659
1995544
1996642
1997900
19981,193
19991,500
20001,632
20011,794
20021,954
20032,588
20043,291
20053,594
20064,050
20074,551
20084,480
20094,615
20104,740
20114,572
20125,015
20135,369
20146,518
20156,093
20166,757
20177,405
20187,437
20198,034
20209,426
20219,028
202210,586
202311,139
202411,600
20259,230