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
1997916
19981,200
19991,548
20001,678
20011,806
20021,981
20032,674
20043,391
20053,696
20064,186
20074,714
20084,587
20094,786
20104,869
20114,781
20125,128
20135,565
20146,738
20156,315
20166,920
20177,683
20187,674
20198,476
20209,808
20219,492
202211,155
202311,702
20245,277