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
1993331
1994679
1995562
1996647
1997916
19981,199
19991,548
20001,680
20011,805
20021,981
20032,675
20043,391
20053,695
20064,187
20074,715
20084,587
20094,794
20104,869
20114,778
20125,128
20135,571
20146,741
20156,318
20166,924
20177,695
20187,681
20198,482
20209,819
20219,512
202211,147
202311,714
202411,232